You might have yourself tested for C-diff (which stands for something a lot longer and harder to pronounce). You must have a stool culture so they can diagnose you. If you've taken antibiotics and are having these severe symptoms so long afterwards, I'd be suspicious. I've known SO MANY people who have had it. Once the diagnosis is made, you are given Flagyl (or something like it) and you'll quickly get back to normal. You can also take yeast tablets, and yogurt with active cultures. Don't let it go on too long without being tested--it's very weakening. Hope you're feeling better soon!
Soibhan