Pain during the bowel movement and anal itchiness

Dear All

I am rahul,26,male from UK. I had my appendicitis operation 4 weeks back. I am getting better with my appendix but after 4 days of my operation I had severe itchiness in my anus and then after one week I have burning sensation during the bowel movement. Few days back I noticed I have light blood in my toilet paper. I went through the pilesand anal fissure forum but I can't find anything similar to mine.Please see the questionnaire below:

Sex: male
Age: 26
Nature of work: Software professional
Habits: Used to do loads of aerobics exercise and light weight training

Describe your main suffering and from how long? I had my appendicitis operation 4 weeks back. I am getting better with my appendix but after 4 days of my operation I had severe itchiness in my anus and then after one week I have burning sensation during the bowel movement. Few days back I noticed I have light blood in my toilet paper. I went through the piles and anal fissure forum but I can't find anything similar to mine.

Exact location? Anus
Any cause which you feel for this ailment? i don't know
What other physical sufferings do you have in your body? i used to have pain inside my anus after sex ( Proctalgia fugax) i think but not sure.
What mental sufferings / feelings do you have associated with your physical sufferings? none
When did it all start? itchy after 4 days of my appendix operation. Proctalgia fugax for more than 1 yr.
What are the things which aggravate or ameliorate your suffering? more itchy if it warms and if i walk
When do you feel better, during hot weather or cold weather, humid or dry weather?always feel same but warm makes worse the itchy

What do you crave for in food items and what are your aversions? salt food
How is your thirst: less,
Normal or Excessive? excessive
How if your hunger: Less, Normal or Excessive? normal
How is your bowel movement and stool type (Constipation etc.)? Stool typre normal but sometimes noticing mucus little bit, when i start my bowel movement its bit paining and burning
How sleep, how are your dreams? normal, dreams i used to get loads
Do you have any strange, peculiar or unusual symptom or feelings? none
What medicines have been taken earlier? none some antibiotic during my operation
How do you look like (Appearance (fat, thin, smart, tall, lean etc)? 75 kg -169 cm
If your are female how is your menstrual cycles and from how long (normal, irregular, painful, clotted, colour etc.) n/a
Family history - What major diseases are running in your family? my mum had vericose vein in her legs
Any other information? Please help me.