Welcome to HCM
We understand your concerns
I went through your problem description. I suggest you not to worry too much. The pulsating sensation from your anus could be due to squeezed vein or hemorrhoid
. Or it could just be a delusion
If you try hard to evacuate, it is possible that some fissures had formed inside and that could pulsate. Therefore, it might be necessary to consult a physician for further advice.
Hope this clears your doubts. Available for further clarifications.