My doctor put me on Diltiazem 24 hr. ER 180 mg. It seems that the chest pains are less frequent, but I still get the tight in the chest and breathing issues I had on the beta blocker. Do calcium channel blockers cause lung thightness? My BP was still around 130/90 2 weeks into the Diltiazem. We are checking again when I finish the bottle. Meanwhile, lots of aches and flue like sypmtoms. I always feel sick and tired. I sleep 9 hours a night, but wake up with anxiety attacks around midnight. I think I want to try Cozar again. The only reason doc wants Calcium channel blocker is due to a mild MVP. Cozar kept my BP nice and low, even when I lived in high altitude and smoked (I don't smoke anymore). Plus the Cozar had very few side effects and hardly any other drug interactions.