Hi, Hannah, and all who've responded here to this thread...
I went off Paxil, after taking one form or another (first Prozac then Paxil) for 17 years just this past December. When I announced to my physician that I had weaned (very slowly) off the medication, his only comment was, "I don't want you to be on any medicine if you don't need it, but I was concerned about your obsessive thinking." In truth, since going off this SSRI, I've been dealing with intrusive thoughts. I know that both my parents were prone to this kind of thinking, of the negative sort. As a result, I think much of this is a genetic predisposition in my case.

I realized just last night, as I was awakened by intrusive thoughts several times during the night of fitful sleep, that I must overcome this or go back on some sort of antidepressant which helps with this tendency. May I ask, are you on any sort of medication right now?
Patty