my family doc. increased my imdur from 60 mg at night and 30 in am , he added an addtional 30 in am . grand total of 120 mg per day .. was having chest pains on and off for 2 weeks needing nitro 1 tab would stop pain. have 4 stents , no heart attacks. I started getting dizzy , headaches and sick to my stomach after 2nd day . wondering if the imdur was causing it .now am back to not taking it . am feeling a bit better . how long does this stay in you system .blu