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My own experience is that the theme switches come on pretty suddenly, but usually at a point when my previous theme has quietened somewhat. I find that in the real heat of the current theme the previous ones seem far less worrying (it’s tempting to think “if only I only had that to worry about” which is crazy as it denies my previous suffering). In some regards my current theme seems like the worst I’ve had BUT equally I do have my previous experiences to go back to - so when my brain says “but this feels so real” I can also say to myself “but the other times you were also convinced it was real” which does help somewhat.

For me is pretty suddenly I find kind of funny that how my perception of things can changes like in one moment. I can think about how It would be impossible for me to doubt about some topic and a week after I am just scared and cant afront any uncertainty about it

I had a few different themes when I was 10 or 11 and now at the age of 26, my themes are totally different. The time gap in between i didn’t experience as much intrusive thoughts or obsessions and compulsions but it quieted a lot. I noticed that hormone changes and/or big life changes trigger my OCD. And my OCD picked back up again after having my daughter.