Quad drifting problem
 

I am having a bad problem with my quad making it near impossible to even attempt rate mode.
My quad is yawning left and pitching (I think that's the term, just moving directly right is how I'd describe it).

I don't believe trimming is what I should be doing (it isn't helping) it gets significantly worse when going into rate mode...
I have crashed it several, several times.

Did you have a crash before this problem appeared?