Quitting two drugs in quick succession may not be the best choice, but I definitely understand wanting to be off of medicine. Especially if you have been on medications for a while and have a period of struggles.
As long as you have pieces in place, set/defined safe courses of action (family/friends/hospital) to go to in case things go south, tapering wellbutrin is pretty easy. Again, try to coordinate with a psych or someone one who will listen to get your needs met. They may see your situation from a different perspective and be able to offer advice.
I cold-turkeyed off of 375 (300 and a 75) but I have gone off a lot of medicines without noticeable bad effects. Your own personal history may guide that experience. Wellbutrin isn't like paroxetine or some of the SNRIs, I'd halve (perhaps even 3/4 depending on your sensitivity) for 7-10 days and cut off a quarter (or cold turkey) from there.
Impulsively going off of medicines without alternate plans is potential for a disaster. Get pieces in place before deciding axing meds will sort out everything. Maybe it will help, but maybe it won't, and you can lose effects in quitting drugs. I had it with lithium and the other posters are right to mention it.
Best of luck and take care