Results
Cause of your symptoms
Your change in bowel habit and abdominal pain could be the after-effects of a mild infection. The rectal bleeding is probably from piles.
Advice
Try the treatments outlined below for two weeks but if your symptoms do not settle quickly or stop you sleeping or working see your GP
Treatments
Eat less roughage and if necessary take a bowel sedative to reduce the number of times you go to the toilet and an antispasmodic tablet to ease your pain. Try careful cleaning around your bottom for your pile symptoms and if necessary use creams and suppositories. A pharmacist can advise on suitable treatments.
What now?
If you get completely better nothing else needs to be done. However, if your symptoms persist for two more weeks or recur after stopping treatment see your GP.
Summary of your symptoms
You are under 50 years old and have a change in bowel habit to going more often with looser stools and abdominal pain associated with weight loss and or loss of appetite. You also have rectal bleeding with pile symptoms.
Additional information if you see your GP
People who persistently eat less to avoid their abdominal pain and lose a significant amount of weight may have a partial bowel blockage which requires prompt investigation in hospital.