M.C.
My son had something similar at that age. I could track the illness. I knew that on Sat. the fever would start. Jump to 103, on Monday it would turn into an ear infection and by Tues. I'd be at the dr. for meds. Every 3 weeks for a year from 1 1/2y to almost 3y old.
Finally I started tracking his food intake and activities. I finally found what I thought was a pattern related to food. Then he broke out in hives! I took him to the allergist, told them my theory that I thought he was allergic to pears. (hubby thought i was nuts!) . They skin tested him and he broke out in hives!
We removed pears and pear juice from his diet and the illnesses stopped.
My daughter last summer had 3 ear infections in 6 weeks just as we were going on a trip to FL. Started tracking her and realized she'd been eating a LOT of watermellon. Stopped the watermellon and the sinus infections/ear infections stopped.
Just a thought.
M.