As per your complaints you are suffering from indigestion
may be due to peptic ulcer
which may also be the cause for the pain.
Antacids, Antiflautulants, regular periodical bland diet is advisable
Avoid chilly & tension. Have a good sleep.
may produce Dysmenorrhea & lower abdominal pain
For endometriosis consult gynaecologost and immediate treatment should be taken.