T.,
I don't know if you would consider alternative/integrative therapies, but I am a chiropractor and have seen children with re-current ear infections benefit from chiropractic care. Sometimes joint dysfunction (aka subluxation) can cause slight swelling and/or inflammation in the structures of the neck. This can cause restricted fluid flow in the eustacian tube (the path allowing fluid from the ear to drain into the throat). Fluid build up can cause uncomfortable pressure (like your ears need to pop) and can also be a good place for bacteria and viruses to settle in and cause and actual ear infection.
Keep in mind that most ear infections are viral and will not respond to antibiotics. Your child gets better simply becuase the virus has run it natural course of 5-7 days. If your child does have an actual bacterial infection he may benefit from antibiotic therapy and controlling the bacterial infection may prevent more serious complications.
Here are some links to articles about chiropractic care and ear infections.
http://www.healthychild.com/chiropractic-ear-infections.htm
http://parenting.ivillage.com/baby/bhealth/0,,40l3,00.html
http://www.chiropracticresearch.org/NEWSearinfect&chi...
There is also more info at www.ICPA4kids.com. This is the chiropractic pediatric group that I recieved my post doctorate education from and they have some resources on their website that you might be interested in.
Also, with regard to swimming lessons. You should talk to the EENT to confirm, as this is their specialty and not mine, but until he gets tubes he can swim without ear plugs. Once he gets tubes he will need to keep water out of his ears, as the tubes will creat an hole in the TM (ear drum)with a direct passage into the middle ear. If he has otitis externa (inflammation of the external ear canal, aka swimmers ear) then swimming would not be a good idea.
Take care.
D. N Williams,DC
Scottsdale,AZ