One thing you might want to try is a coffee enema. It doesn't sound like much fun and it isn't, but it seems to get some pretty impressive results and fast. I have done two so far and am already feeling better.
I know something of how you feel. I'm 25 and have most of the symptoms you mentioned. But I'm so far thinking that this coffee enema thing could be a reasonable sized piece of the puzzle for me. I've thought that before many times of course. But just because I've tried 100 things before and they didn't work, doesn't mean that the 101st thing won't work.