Hey, I noticed nobody has responded yet, so I figured I would give it a shot.
I think most people here can relate to that feeling, so you’re in “good” company, I suppose
I wish I could tell you what you need to do to get through / get over this, but as I haven’t been able to myself, I’m probably not the best person to give you advice. Others have had success though, so maybe they can chime in.
The way I survive is by distraction, and when your thoughts are so intense as they appear to be right now, maybe that’s the best option for you at the moment to just refocus your thinking on something that requires your undivided attention. A video game, a puzzle, a project, an exciting fast-paced book, etc.