The only way you can tell for sure whether you have Chron's or colitis is to go back to the doctor and ask about
it or to have some more procedures...but you really shouldn't worry about
whether it is Chron's or colitis right now until you have the right answer from the doctor. My friend with Chron's was wrongly diagnosed with UC for ten years, so just tell your doctor that you want to make sure it isn't Chrons and that you have some questions. I have UC, but I myself have wondered whether it might be Chron's or not because I have had pains pretty much everywhere in my abdomen, although most pain is on the left...so I would think that pain everywhere can just happen sometimes.
I have no idea about the tongue thing...sorry I can't help you with that one.
The boil, or bump, you might want to get checked out if it gets any worse. It is probably just an inflammed or infected hemmoroid or something similar, but I would put some antibacterial/antibiotic cream on it if it looks like it has a white head because that could be a boil or even MRSA. One bad thing about this disease is that you have to start using A LOT of public toilets, which can be covered in MRSA-related germs...so make sure you double up on the toilet paper on the seat.