Help~~

So, my doctor prescribed me to take OBMom capsule (multivitamins) and Hemovit (ferrous sulfate). I'm okay with it for the first 3 weeks, but suddenly starting this last week of October, I started throwing up after taking both meds. Yesterday, I only took OBMom and I feel nothing. Same goes today, I skipped the Hemovit. Is it okay to skip it without consulting my doctor? My next checkup will be on Nov 7. I can't take the Hemovit anymore. Tho I need it because my BP is low and I always sleep late..