I have had what you have listed in the past: intrusive thoughts and images without the need to perform a designated action to quell them. I used to see bloodied images of people that I knew, or images of myself inflicting injury to them in violent fashion; sometimes it got as bad as me seeing myself cannibalizing them. To make matters worse, I have AS, and in this way each image was accurate to the most intricate and fine detail: every drop of blood, or tear of the skin, or exposed bone was all included in these truly gruesome images. I used to refer to it as "the madness," when I considered it internally, but to this day have never told anyone whom I know personally about it. I am not even a violent person, and I could not figure out what was wrong with me. With my rant complete, I would like to finish in saying that you are not alone (whoever you are), and that it will, in all odds, pass.