There is an extensive list of potential drug interactions, these two would be minor-but best to take the same dosage of drug each day, varying doses are more trouble than steady intake. Procardiaxl, normodyne, lipitor, flurbiprofen, cytotec, cozaar, prilosec, hytrin, imdur taken daily, history of ulcer, back surgery, high blood pressure, etc. Dr. says it may be drug reaction, but doesn't seem to be alarmed. It is getting so severe it sometimes lasts all day. Hard to say since you are on so many drugs.
None leaps out as the cause.
Klonopin is a good drug for muscle spasm, but, addicting over time. There are several muscle relaxants, like Flexeral which may help. Massage therapy and physical therapy are usually good. Accupunture is also useful in selected cases. As to the migraines, it would be unusual for a migraine to last two weeks.