If she's having wet diapers she's not starving. You should be getting 5-6 wets per day minimum. Like you said, poops are variable.
Like pp said, just keep nursing, keep offering. I'm thinking it's most likely a dip in your supply caused by your period coming (which is totally normal). Sometimes it can make the milk taste funny, which upsets some babies, especially the first few periods you get once they come back.
Just in case there is something else going on, watch for physical signs of dehydration- no tears, dry mouth, sunken eyes and fontanel, not enough wet dipes.
I was going to say bring her to the ped to check on the ear infection, but if you are out of town that might be difficult to do. Maybe one of those minute clinics. Or...you could try giving her tylenol and see if she calms down. Not exactly scientific, but if it's pain that's causing her fussiness you'd get your answer.
“We are not put on earth for ourselves, but are placed here for each other. If you are there always for others, then in time of need, someone will be there for you.”