Ugh. i can relate. i had that, too, (not so much gas, but yah, that horrid bloating. :( and surmised that it was from a certain herb i was drinking, in tea, that was just not right for me. I hope you'll find something better.
Finallyfaith's suggestions are good ones. I was originally going to do a liver cleanse after my parasite cleanse, but now i think elevated H20 levels and fasting would be better for a week or so w/ maybe a tad of milk thistle, rather than subjecting my body to more strong herbs. I'm already unsure if the 3 month parasite cleanse is a good idea for me. So I'm thinking just plain water is the key.....