I have these sorts of thoughts from time-to-time. In my case, at least, I think they are at least somewhat the result of a build-up of generalized anxiety & fear. I think it may help if you keep talking about it with your T & perhaps keep posting about it here on PC.

Trying to ignore, or repress, thoughts such as these is not the way to go. If you can see them as just being something that many people experience &, when they come up, just let them drift away of their own accord, this may be helpful for you. Keep in mind, they are just thoughts. They have no power over you except for that which you give them.