I just pulled back the newspaper I'm using to mulch my tomatoes, and there are little white crawling awful looking things. Really small, I don't think they're maggots, but I don't care what they are, they have to go. I guess it's because of all this rain, or is it the newspapers???
Sounds like you are keeping them too damp...we've been telling you how tomatoes needed water and I guess we've kinda scared you some.
Make a mix of 1 tablespoon dish soap and 1 tablespoon mouthwash to a gallon of water and spray the surface of your soil.Leave the mulch off for a day or two.Really,I don't think they're too harmful,but you can be on the safe side.