I Was Just Prescribed Three Days Ago Dilitiazem For Coronary

I was just prescribed three days ago dilitiazem for coronary artery spasms causing chest pain but not related to heart disease…emergency cardiac cath showed no blockage, and no evidence of heart disease. These spasms did cause st segment depression in inferior leads of EKG. I was given 30 mg bid; I feel terrible on it, my cardiologist is out of town, and I want off of it….dizzy, fuzzy in the head. How do I do it? I am a 65 year old female, take no medicines, and very athletic.