I am sort of experiencing the same thing. My daughter is 5 months old and I have just started solids and have been doing cereal for about a month now. She was getting really good with the cereal so I introduced apples, then pears, then bananas. Now she has figured out how to lock her mouth shut and once I sneak some food in she will just hold it in her mouth (wide open) then finally swallow - as funny as it is, I can't tell if she just doesn't like the food or is still learning. She also has been drooling for quite a while. She is starting to shove EVERYTHING in her mouth now - including my face :) I massage her gums a lot, which she seems to like, but I think it's something we just have to ride out. I am just hoping they all come in at the same time, so we only have to go through this once...wishful thinking! Oh yeah - she also was only getting up once during the night to eat, but is back to two, with a couple extra trips in to give her a pacifier. I was just getting used to sleeping a little longer and now am back to sleeping a few hours at a time.
I know this probably hasn't helped you figure anything out, but I just thought you would like to know you aren't alone, and I do chalk this all up to teething too.
Also, maybe we could meet for a play date or go to story time together if you are in the Nashua area.
Good Luck
L.