I would say to try your best to not analyze this. I read an article yesterday by a Dr. Greenberg about rumination and it really covers how even asking things like are typically forms of rumination. So instead how about you sit with the doubt, discomfort, anxiety, and get back to whatever it is you were doing before. We’re you reading, eating, excercise good, go and do something for yourself, or to avoid thoughts…but to focus on what actually matters to you.
i do not want to give into reassurance, so hopefully my answer helps. when you start to feel groinal responses to your thoughts - instead of worrying if it is arousal, try to be ok with the fact that maybe it does arouse you. how bad would it be if it does? you could try using those times as a big exposure. instead of compulsively trying to find answers as to why this might be happening to you, accept that it is and sit with it.