Hi Ann,
I'm not able to help with the medication issue; however, I wanted to make a quick suggestion. If you make some diet and lifestyle changes to promote a lower blood pressure you may get to a place you need a lower dose of medication. A lower dose may not cause the unpleasant side effects. Or better yet, no meds at all! Check out the link below for some information on diet and lifestyle changes to lower blood pressure.
http://www.healthcentral.com/high-blood-pressure/treatment.html?ic=4019
All the best,
Lisa Nelson RD
7 Natural Ways to Lower Blood Pressure