My Doctor, And Pharmacy Continued To Prescribe A Daily High

My doctor, and pharmacy continued to prescribe a daily high dose of Reglan to me and never advised me to stop until 8 months later when I went for a physical and she says "oh my god you have to stop taking that, it can cause a muscle issue" I was on the Reglan for nausea from severe chronic migraines which I take Depakote for which gives me pretty noticeable tremors. I won't know unless I was off the Depakote? How bad think it is?