Hi NoNo, I remember you! Welcome back!

I've had problems with serious PTSD so I know just how difficult it can be to deal with bad thoughts and feelings. Knowing that feelings aren't real doesn't much help in the midst of things. and, for me at least, setting out to block bad thoughts never worked well at all. What works better for me are those activities that require focus on the present moment - like cycling, mountain biking, tossing kettlebells around over my head, etc. If I weren't so afraid of heights I would have taken on rock climbing, it sounds like fun!

I like LPH's advice to mix up the riding and go different places/different types of riding than before. It is hard to shut up that inner voice that compares our current activity level/fitness with the past. Meander down scenic back country roads, go for grocery runs, ride in local parks. Focus on the scenery, breath deeply, enjoy the world around you.