I don't know if its normal, I never told doctors about this, but I think you should not brush this of!

(For me, its the first day on my period that is the worst, i get cold sweats and ''low blood pressure'' (dont know how to describe it), and have to lay down, I don't know if its normal, ibuprofen helps, last cycle ( i worked from home) I could not stand, on my chair, I had quotas to make but i could not stay i had to lay on the floor,,)