Hi,
Welcome to ehealthforum,
The persistence of abdominal cramps and menstrual symptoms could suggest possibility of endometriosis, pelvic adhesions, adenomyosis, PID, uterine fibroids, etc. It is difficult to comment on the cause for the symptoms that you describe without examining you. The exact cause can only be made out after careful evaluation. Visit your doctor/gynecologist at the earliest for thorough examination and further evaluation to look for the underlying cause. Treatment as needed (based on examination findings and investigations results) would be started to help you. Consider being in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Drink plenty of water. Take adequate rest. Maintain healthy diet.
Take care.