I have very bad stomach pain, back pain and acidity during periods which dont calm down despite of having heavy dosage of pain killer also i have tried homeopathy medicines and Ayurvedic treatments. Its only when i do all this together that my pain reduces. This pain persists for the first three days of my periods. However my periods are never late and infact are always generally 4-5 days before the last date of period start. Also i do walk alot every day ensuring enough workout.