Hello S.,
My daughter had similar issues... although, hers was the opposite. she got constipated and also had ear infections.
Could he be allergic to latex? my daughter ended up w/ an ear infection at 2 months old because after her check ups she would end up w/ a cold... wich later developed into ear infection and later into asthma. Maybe it will save you a few months of despair. insist on latex free gloves for now and when going to the doctor, go early morning ... less powder/latex particles in the air. remember that means no playing w/ balloons either. by the way, the blood test might come back negative even if he's allergic to latex.
Could he also have eczema?
allergy testing! check for milk, soy, nuts, grass, dust, etc. get him checked.
no air fresheners, candles, etc. if he has allergies, that might be irritating him-those things have too many chemicals. probiotics every day for him and for you if you breastfeed. (to balance the good bacteria in his system.
no cow milk -- soy formula?
if you breastfeed... skip the milk for now and get your calcium/vitamin D from other sources.
aromatherapy may be helpful. putting peppermint oil on a paper towell it infuses the air and help clear stuffy noses. make sure he doesn't get to it.
have you ever considered going to a chiropractor?
My Godson had similar problems too. he got tubes put in and also was tested for allergies. it turned out that he was allergic to milk, soy, wheat, ragweeds (which include sunflower, safflower, daisies, dandelions, echinacea, chamomile, lettuce, artichoke)
read labels every time. also, lotions, shower gels, shampoo, conditioner, read those too.
just a few thoughts. follow your gut and keep looking for the answer. just allergy meds is not the answer if he keeps eating/using what makes him sick.
I'll be proactive and give you this info, just in case you end up needing it when birthday time comes around:
--- http://www.reallygreatfoods.com/
the highest quality baking mixes for people with special dietary needs, including gluten free, wheat free, soy free, dairy free and casein free baking mixes. Really Great Food for gluten free food products.
Good luck! ~C.~