S.,
What a great questioning parent you are! Could be food issues, and it seems worth following up on this since this is your mother's gut instinct on which way to go. This instinct is usually very reliable.
For food intolerance testing, do it yourself, without a doctor referral, through www.enterolab.com. Lab is in Plano. Order test kit online, send in specimen, they email you the results. Easy easy easy! They do stool tests, which are more reliable than blood and skin scratch which are the standard in most allergist or GI doctor offices. You can test for gluten and casein, as well as others like soy, through them. When you eliminated milk, did you replace it with soy? If so, look at this as a culprit too. See the following article on this:
http://articles.mercola.com/sites/articles/archive/2008/0...
He's very young and will need some good nutrition, if you are not breastfeeding. You can research raw milk options on www.mercola.com as well as www.realmilk.com. A good state certified raw milk dairy nearby where you can get raw goat's milk, which may help him a lot, is www.randcdairy.com in Collinsville. Go north on tollway to end. Take route 380 west to route 377 north. Farm is off of 377 on the left after Pilot Point and before you get to the town of Collinsville. Rocky and Carol are the farmers.
Find a pediatrician who actually understands something about health and nutrition. Unfortunately, this excludes 95% of the pediatricians out there, so you have to look hard. One that I know of is Deborah Bain, MD in Frisco, www.healthykidspediatrics.com. Another one is Dr. Daniel Chartrand, family practice doctor in Allen, www.harmonyfamilyhealth.com
Also consider vaccinces. I bet they are dumping quite a few of these into him by now. They are filled with major toxins that are so toxic that the manufacturers refuse to disclose them to parents or physicians. Vaccines are also not researched and tested adequately. No physician can tell you what the affects are, because its never been researched properly. For vaccine info, you can begin your research on www.mercola.com to educate yourself bette about his topic. There is ABSOLUTELY NO REQUIREMENT that you vaccinate him in Texas. Texas is a great vaccine state, allowing you to opt out for "philosophical" reasons (ie any reason you want) with a waiver signed by a parent and notarized. He cannot legally be excluded from any school or program if you exercise this right. The only place he will be excluded, unfortunately and ironically, is most arrogant pediatrician's offices. They are so threatened they will lose this lucrative revenue stream. But Dr. Bain and Dr. Chartrand are two that I know won't kick you out.
Generally, www.mercola.com is a great place to do research on soy, gluten, raw milk, vaccines, etc.
If it's an ear infection, you still might want to investigate WHY he has a chronic ear infection and why his body's immune system is down. Ear infections are not "normal" for kids, contrary to popular belief. Most ear infection kids have undiagnosed food intolerances.
If he's teething, this will pass, but it sounds like you think there is something more.
Good luck.