What is the best way to get THC out of your system FAST?

Hi, I have cannabinoid hypermesis syndrome (large amounts of thc cause me to have cyclical vomitting and is excruciatingly painful) and in order to relieve my symptoms I have to stop smoking. I have stopped, but there's still THC in my system and so I am still getting extremely sick in the mornings. I know it will be better in a few weeks but I am just wondering if there are ways to speed up the process of getting it out of my system. I heard sweating it out helps, and drinking lots of water.. but that may just be for passing a drug test. Any advice would be appreciated.. I'm fricken dying.