I like disclaimers: it's not advisable for doctors to comment on management unless he/she has seen the patient.
However, based on your complaints, these are some explanations.
You actually have two issues regarding bleeding, and it would be better to separate them.
1) vaginal bleeding/ irregular menses: how old are you? hormones usually cause abnormalities in menstrual flow, women who get pregnant and experience 'missed menses' are affected by the same hormonal changes in the body, that is why your doctor gave you OCPs (oral contraceptive pills). technically you are never too young for these medications, because they contain the same hormones found in your body, one of the most common OCPs--progesterone pills, can actually resolve a great number of abnormal menstrual bleeding--so it might help if you gave it a shot. it would be good to know that some OCPs, especially those containing estrogen can help improve complexion
see a qualified OB-GYNE, some tests that may help are the following:
1) annual pap smear
2) diagnostic curettage which is an outpatient/day procedure
3) pelvic ultrasonography
4) hormone level determination
1) bleeding from the gastrointestinal tract (blood in stool and through the other end): it may be prudent for you to monitor other accompanying symptoms of abdominal discomfort such as pain, indigestion, heart burn, reflux or the sour tasting fluid that comes up your mouth after a meal, excessive burping, difficulty taking bowels. the diet in singapore is a big factor for some people to develop gastritis or hemorrhoids, and other abdominal complaints due to the large amount of spices in the food. hyperacidity may cause all these symptoms and if they worsen, ulceration and bleeding. diet modification is one of the most effective but effort-driven forms of management for dyspepsia, it includes not skipping meals, not overeating, avoiding acidic food and drinks like tea, coffee (yes coffee), juices, even milk, everything in moderation is a good line to follow. of course there are the medications that can greatly improve and cure the problem, but effectiveness of therapy relies greatly on diet modification.
see a qualified gastroenterologist, some tests that may help are the following:
1) digital rectal examination
2) endoscopy
3) tests for bacteria that cause a great number of gastritis cases (h. pylori)
4) stool exam
OK. be well.
Well, best be making something then.