For your peace of mind, I'd highly recommend that you see your pediatrician. Neither of my babies had the classic ear infection symptoms (fever, increased fussiness, pulling at the ear, cold, waking often at night). Every time I was sure they had an ear infection, it was a cold or teething. Each time I was sure it was not an ear infection (no fever or waking at night), they had one. There's really no way to tell until the doc looks at the ears.
Once you've ruled out the ear infection, he/she can give you guidance on teething solutions & feeding plans.
Based on your info, any & all of these can be factors. Isn't this fun :)