Will pray for you. I know where you are at on this, believe me. It is a form of mind torture, that is for sure. I went through several years of it because of previous situations in my life, & I can still slip into it if I'm not careful.
My advice to you is, don't sit alone & think about negative things too much. Get out with friends & keep a positive outlook! I started to keep a "Things I'm thankful for" journal, & it has helped, especially looking back over the ways God has blessed me.
Example: I recently became friends with a blind man, who did have his sight for 23 yrs. before going blind. Now, we all *know* about blind folks, but to know one personally is an entirely different matter; You never know what someone else goes through until you know them personally.
Talking with this guy has really "opened" my eyes, no pun intended...
Sorry, I didn't mean to ramble on, I just thought you might find a personal experience story helpful.
God Bless You.