B.S.
Honestly, everything the doctor told you is right. You'll find the infant Pedia-care won't have the same effect on the baby as adult Sudefed does for you. And it really depends on whether or not he's stuffy or has a runny nose. I assume he's stuffy since you purchased the "Little Noses". All of the parents, whose children I've cared for, have had good luck with "Little Noses". It's just to put moisture in the nose...a cool mist vaporizor will help, if you prefer not to use the nasal drops. Vicks has a new rub for children, too. It's not quite so over-powering. You can put it on his chest so that the vapors will soon penetrate his nose...or you can put a little under the nose. Either way is fine.
Now, I understand about the swing and the problem with raising his bed on one end. I use the bouncer for any infants I have who are having trouble with congestion. It's slanted just enough that they can sleep and breathe, too. It's handy, too, because when I'm trying to feed another infant or doing bookwork, I can place my feet on either side of the bouncer frame and rock the baby to soothe him/her, and put them to sleep.
It takes time. Just listen for wheezing and check for fever. Either of those needs to be checked by a physician with one so little. Or if there is redness around either ear or pulling or slapping at the ear. Possible infection or too much fluid. Also, if he gets to where he cries and turns loose of the nipple during feeding. That is sometimes a sign of infection. It hurts for them to suck.
Don't hesitate to change the decongestant if you feel this one isn't working after several days. Anything over the counter for infants can be used. Moms sometimes have to try different ones to find what works for their child. Pedia-Care is the first one reccomended by most doctors.
Good luck, Mom, and God bless..