My periods have been regular and consistent since day one. On 22nd cramps begin, 24th bleeding starts lasting 6 days. First 2 days are heavy, next 2 medium, last 2 light. I take multivitamins and lots of water. 4 months ago I began replacing the multivitamins with Carnation Breakfasts drinks. I don't work out and I'm still a virgin. 2 months ago cramps started on the 22nd as usual but painful, not usual. I normally experience light cramps. And no bleeding would occur unless I was on a toilet. Sanitary napkin was always spotless. I switched brands but nothing changed. I immediately stop drinking the Carnation Breakfast drinks. This was repeated last month. Yesterday, the 24th, I felt light cramps. Today the 25 I continue to fell light cramps. I was thinking of going back to the multivitamins. What SHOULD I do?