You need to see a gastroenterologist.
Blood tests looking for celiac disease, as well as a 24-hr pH study to exclude GERD or acid overproduction can be considered.
The rectal bleed should be followed up with a colonoscopy.
A urinalysis as well as tests for STDs should be considered to evaluate the penile burning.
These options should be discussed with your personal physician.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
www.kevinmd.com
You need to see a gastroenterologist - sooner rather than later.
I would get checked for gluten intolerance or celiac sprue.