Hi Paulette, I would call your practitioner.
I know magnesium suppose to stop head aches.
I wonder if it is the potassium? How much potassium did he put you on? I know I had to adjust my intake pretty much daily do to I did not feel good on to much. If I knew I was gonna eat something high in potassium I would skip 1 of the 2 potassium pills for the day. Hope you feel better.
Are you on anything else besides these two minerals?