Diltiazem is a very potent drug but if you have a hsitory of angina or if blood tests indicate calcium build up, you're on the right drug. If not it may be time for a switch to something more tolerable like Procartia or even Lopressor with a diuretic chaser. I'm not finding anything herbal that acts as a calcium channel inhibitor and I'd be hard pressed to recommend anything without finding out what the calcium levels have been lately. Also you might be able to better tolerate 3x 80mg dosages rather than bombard you with 2x120mg. Talk to your doctor, he may have a better angle on everything after a few simple blood tests. I'd also wonder is 81mg aspirin is a little much considering the diltiazem. I'd see if cutting down or either is better for you.