Why Am I Getting Bad Stomach Cramps, Diarrhea, Vomiting, Pain In The Lower Back And Legs?

Hello I am getting bad cramps in stomach,pain in lower back and legs. Loose motion and vomiting done once. Have taken metrogyl. Can I take maftal spas almog for cramps and pain. I have got gap in my periods of almost one and a half month. Still not got my periods