Why do I have pain inside my anus?

Hi doctor,

I am 27 years old. I have pain inside my anus. My anus outside is normal with no pain and injury. Along the same line of my anus right inside I feel the pain. No blood and passing stool also easy. When I sit on the toilet I used to sit with legs spread out a bit. Otherwise when I walk or before I sit down or when I intend to change my sitting or lying position, I feel pain. No other sign of sickness present. I do not have fever. Please note that sneezing, coughing or even spitting out increases the pain. Also in the morning, the pain seems to reduce but as the day progress, the pain increases. I am out of town for a project. So, I cannot go for any test. There is also some loss of appetite. The same thing occurred before two years also. Currently, I am taking O2 (Ofloxacin and Ornidazole), Prowel and Cremaffin. I just started taking them this morning but no effect as of now.