K.R.
My little guy went to daycare for awhile when he was turned 1. It was a mess and he had ear infections constantly. We ended up getting a referral to Dr. Jonathon Pillow in Edmond. He checked our child's ears in two scheduled visits (evaluating if he really needed tubes or not). He recommended not getting the tubes, and our boy has been fine without them. In fact, we took him out of daycare and put him on OTC Zyrtec for allergies which really helped alot. We really liked the doctor and I am thrilled we weren't pushed into just putting tubes in without really needing them. I would start with an ENT (ear, nose, and throat) if you haven't already.
Here's his info:
Ste 300A
501 E 15th St, Edmond, OK 73013-5035
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I have also heard that chiropractors are good for sinus issues, but I know how comfortable personally I would be to use it on an infant (probably because I don't know much about it, etc) - but everyone needs to decide what's right for their family. My cousin takes her 4 year old to a chiropractor in Edmond to help alleviate sinus issues - I believe his name is Dr Jackson? My cousin has really been happy with the results. It might definitely be worth checking into. I know how miserable the whole household gets with a little guy is so sick.
Good luck & I hope your boy feels better soon!