having pain after anal sex

Hello SteadyHealth Members,

I have had anal sex with my boyfriend for the second time again after a year.We used a lot of water based lubricants..he was gentle and smooth,and cleaned before the anal sex.I did not have problem with it during the situation.
The problem started just afterwards.
I think I have not emptied the bowel before the anal sex.So I had to go to the toilett after the situation..

At night I could not sleep because continously I had the feeling that i had to defecate...i could but just a very little..I also had pain trying to do it..and i had some blood on the toilett paper..
i took a pain killer..i had pain on my abdominal..

today I feel rather better..
but still when i try to defecate it is painful..and it is not like before having anal sex...


though i dont have abdominal pain today..thanks god..

do you think that should i see a doctor about it?
what kind of doctor i have to see for this problem?

I am very shy about it,I dont know how to tell it to the doctor that this happened after anal-sex..

the pain is not like a glass or knife..as i read on the internet..
it is more like a discomfort..to tight muscles..as if it got tired of it..

I dont know..

please recommend me something..

what should i do ?

I need help,please..

thank you very much.

Gudi