Yes, in the beginning, I had that "stoned" effect too. That will end.
Therapeutic effects are such that we don't obsess on things. That's why it's so effective with smoke cessation. The bad thing is that I forget things easily, and have to write things down in my planner, or else! lol!
I can't speak to the weight thing. Talk to your doc about that.
This is not an SSRI; there is no "reuptake" to deal with welbutrin. It works on different neurotransmitters. Can't remember right now which ones.

See, I told ya it makes me forget things, LOL!
Good luck tomorrw when you call! Let us know how it's going.
Shalom!