Hi welcome to Health care magic forum.
Thanks for choosing H.C.M.F.
You have just finished 3 days period instead of 5 days heavy period.
You had head ache weakness, hot flushes, and supra pubic pain. This is all suggestive of pelvic inflamatory disease,or just a urinary tract infection
I advise you to consult a gynaecologist for diagnosis and treatment.
You may have to undergo M.R.I. besides other Other routine tests for confermation.
Wishing for a quick recovery.