Thanks for writing your query.
After reading your post, it seems that your symptoms can be due to gastritis
and bleeding from gastrointestinal tract.
I would suggest that you should get yourself clinically examined and investigated by a Gastroentologist.
Following investigations may be helpful :-
2. Stool examination for occult blood.
3. Ano Rectal examination
by a medical professional.
I would advise that you should take an antacid like Omeprazole
40mg once a day before meals along with Domperidone
30mg for relief from your symptoms.
Following precautions will be helpful :-
1. Avoid spicy and oily foods.
2.Avoid being empty stomach for long periods.
3.Avoid mental and emotional stress.
4.Avoid smoking and alcohol, if any.
5.Avoid self medications, especially pain killers and steroids.
6.Drink lots of water daily.
7.Eat light meals prepared under hygienic conditions.
8.Avoid gas producing foods like peas, cabbage, legumes, etc.
I hope this is helpful to you.