Yes, intrusive thoughts are surprisingly common in people with OCD. Because ASD and OCD have such high comorbidity, I wondered if there would be a fair number of people on these boards who experience them. It seems like there are.
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I would be interested in learning how you survived your natural disaster. I'm sorry that happened to you.
Although some people experience intrusive thoughts as part of PTSD, this was not the case for me. By that part of my life I was a lot better at recognizing my obsessive worrying for what it was. I seldom experience intrusive thoughts anymore. I do sometimes run into social tangles I've wound myself into during that time in my life though. This is hard to explain to others, so it makes things difficult.
I don't like to talk too much about the darkest parts of my intrusive thinking, but probably the funniest one in retrospect (having been raised Catholic) was that I was secretly "being called" to be a nun.

Now, before any of you worry, I didn't hear voices or anything like that. We were just constantly told in school that thoughts which stick in your head for days are sometimes a subtle message from god (yeah, it's messed up, but it's religion, what are you gonna do?). Well, I could think of nothing more frightening than becoming a nun, so whenever nuns in my school would look around the room and say "One of YOU will be chosen by god to be a nun one day" I would be terrified, which would cause me to worry, but then realizing how much I worried about being "called" to be a nun made me worry even MORE that I was indeed supposed to be one. Hence the positive feedback loop that is the obsessive type of thinking.
The worst part of having obsessive thought cycles like this is not knowing that it's just an obsessive thought cycle. Once I learned that getting stuck in this thought process was the problem, not the thoughts themselves, I was able to climb my way out. I think it didn't help that I was a very bright kid stuck in somewhat remedial classwork at the time. My mind needed to stretch its legs. I was like an indoor border collie.