sounds like thrush to me (the blisters in mouth), ear infections can easily be gotten from letting baby lay with bottle, rather than holding and feeding. They milk (pardon the pun) it and do not actually swallow the milk immediately, so instead on finishing in 5 minutes, take an hour, however, the thrush could be the cause.
The remedy is a prescription I can not recall name of (youngest is 17, give me a break), but think it is amoxicillian (sp) but is pink liquid, remember that for sure.
Here is a link to more links, verifying my diagnosis.
http://www.ask.com/main/askjeeves.asp?meta=1&site_name=&origin=0&ask=Thrus h+In+Infants
Good luck, it sucks when little ones are in pain I know.
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