I'm with Lemoncake, I feel like 4 months is a pretty short period of time.
I've been going longer (think years) and I believe I have changed.
Stuff that would have sent me spiraling downward in the past doesn't affect me as much.
Are all of my problems fixed? No, but I think I have a lot more awareness of them and understanding of them. I have a lot more knowledge of what tends to bother me and why and how to react, rather than just seemingly randomly flying off the handle.