Nothing to worry about, I went through it all a couple of years ago, just because I was passing blood on occasions.
Started off, first doctor had a poke about with rubber glove and finger. He then recomended me to a specialist.
Went to specialists, nice gourgeous blonde nurse approached me and told me to drop my pants in front of her, I settled for just my trousers, but she wanted everything off, normally I would have had them off in a jiffy, but this was different, if I'd have known I could have done a bit of preprep to make the old man look a bit bigger, usually I'm poking them, but she was going to poke me I presumed. Anyway specialist gets me laid on a couch on my side with knees under my chin and sticks an object up where the sun don't shine. He has a good look round and cannot see anything, so he recomends me to go to see an other specialist.
I go to the next specialist, after having to take a enenma and clear my system out. Eventually once again I assume the position, and he then starts to ram a camera on a long tube up me. Whenever he got stuck he just pumped air into my pipework to inflate it so he can make progress. Don't know how many feet of this camera went up me, but I felt nothing apart for a bit of discomfort at times. All the time I was watching it live on a large monitor along with another gourgeous blonde nurse stroking my arm to comfort me. At one point he took a sample from my pipeworks, on the screen a claw came out of the camera, grabbed the lining of my pipework and ripped a bit off, but I felt nothing.
After that I was put in a recovery room for similar patients with the same examination, mixed with females, so that I could f**t to my hearts content to get out all the air in my system, but it was a bit embarrising. Anyway after about 30 mins I said I was OK so they let me go. Walking through the hospital, I could still feel all the air inside, when all off a sudden at a large junction in the corridors with lots of people to and froing I froze solid as I felt the almighty biggest f**t coming on and there was no stopping it if I kept moving. I remained in that position nipping it and slowly let it squeek out best I could. Was I glad to get in my car and f**t all the way home.
Anyway after all that they found nothing and presumed it just had to be down to anal fissures which anyone can get occasionally.