I've had similar thoughts mainly when I'm depressed and anxious. Hopefully, if you can get rid of the depression the thoughts will subside. Of course, I know how hard it is to get rid of the depression, since I'm med resistant and only have fleeting times without it.

One thing I try to do when I'm anxious it to do relaxation strategies. I use apps on my iPad to help. One is Buddhify, which mainly works on breathing and Relax that is a guided muscle relaxation that I use to sleep. I find they help me distract myself from my thoughts. Of course, I go to therapy too and my counselor helps me through some of the bad thoughts, by looking at them logically.