RSV.... probably weakened his lungs. Especially in a 3 month old.
Thus, once the lungs are weak, it is susceptible to other lung problems and illnesses.
Pneumonia... is a complication of RSV, and so is Bronchiolitis.
Other side effects/complications of RSV are: asthma, ear infections, dehydration and heart-failure as a result of labored breathing, and lower respiratory infections. Even though his RSV was when he was 3 months old... and he is now 2.5 years old... he probably has a tendency toward lung illnesses... now, or it was pre-existing.
With lung problems.... there does need to be help via medicine. If untreated, a lung illness/weakness can get worse. I am asthmatic and have been since a child. The asthma medicines, are actually therapeutic.... versus if a person does not use the asthma medicine... it is worse. Especially if having asthma attack.
There are many different kinds of inhalers... quick acting & rescue inhalers, maintenance types, and those with steroids or not. But each one has a specific purpose. So you need to know what that is... and why, and how to use it for your son, correctly. If not it will not help him.
I would also, have him stay away from anyone who is sick or has a lung cold etc. Because if he gets sick, he can get another round of lung infections/illnesses etc. When other people are sick...I DREAD it, because whenever I get sick, that is when my Asthma acts up more... and asthma is extremely debilitating AND can be fatal.
Cold air/weather also makes it worse upon the lungs.
You need to know the triggers, and stay away from ill people.
Claritin and Zyrtec is both commonly prescribed, as well as Allegra. BUT... each one works for an individual differently. I don't like Zyrtec for example, but Claritin works for me and Allegra. So you have to see which one works the best. But you do NOT need to be on 2 different antihistimines at the same time... that is simply duplication and over-medicating. BUT.... you do also need to use an inhaler. Usually 2 are prescribed. One for daily maintenance and 1 "rescue" inhaler/quick acting inhaler. That is what I have.
The oral steroids and antibiotics your son was on, has a purpose. The oral steroids.... was because his lungs was probably in bad shape and he probably had a hard time breathing and/or there was shallow breathing and/or the oxygen levels in his blood was low... thus, the oral steroids acts to REDUCE inflammation of the bronchial tubes... so that he can breathe and take full breaths. Then, the "antibiotics" were prescribed to stop his infection.... in his lungs.
THAT Is the regime I have been on too before, when my lung illnesses/asthma was already at an ACUTE stage. Otherwise, I may have ended up in the hospital.
So that is the usual medical recommendations and medicine use prescribed.
Sure, I have asthma, and I am "allergic" to basically any sort of dust or pollen or anything in the air. So you cannot stop what is in the air nor have him live in a bubble for the rest of his life. BUT.... you can control the quality of air in your home. Get air purifiers. Have him do exercises that strengthen the lungs... ie: swimming, certain kinds of physical activity etc. Also, do "deep breathing exercises" which helps A LOT in strengthening the lungs. Look it up online. It is very helpful.
He needs to strengthen his lungs.... as well as keep up with medical maintenance/medicine as his case requires.
Put it this way: if an asthmatic does not have proper medicine, nor takes medicine... you can basically die. Asthma is a very serious and critical lung condition... and if not managed properly. And if not understood properly... so you must make sure... you understand Asthma, fully.
Asthma... what is it? It is like suffocating in various degrees. Like as though someone put a pillow over your face.... and that feeling of you can't even take a breath. That is how it feels. Not even being able to walk 10 feet, without being completely out of breath and needing to sit down just to rest so you can breathe. That is an asthma attack... and how it can feel while the lungs are under duress or sickness.
All the med's you mentioned that your son has been on. That is typical. I have even been on all of them, too.
Next, how come no one wants to test him for allergies?
Or, what to you may be allergy symptoms.... may just be Asthma symptoms that he has. Cold air, dust, pollen, certain things can make asthma worse. "Stress" also can make it worse. When I was pregnant with my 2nd child... even pregnancy made my Asthma MUCH worse...and I had to be on my Asthma meds when I was pregnant. Everyday.
Once a person has asthma.... it is not something that just goes away. It is there all your life. But so you need to understand what it is, how to manage it, how to recognize the triggers (if any) for your son, what med's works best for him, learning to recognize if his asthma is coming on or getting worse etc.
Each person is different....
Ask the Doctors all you need to, to figure it out and even ask them "why" they think it is Asthma???? Or are they just guessing? IS it conclusive? Why? How can you help him? etc.
All the best,
Susan