How To Cure Allergic Reactions Caused By BP Medication?

Husband has a pituitary macro adenoma and high bp that is was not treated. His numbers radically change from normal to low to high throughout the day. MD thinks that applying bp meds, all of which have been used when husband was 100 pounds heavier in 2004 - 2009 and caused allergic reactions; slurred speech, swollen tongue, swallowing problems, swollen lips and fingers, falling asleep while watching a stimulating program, and worst of all fainting. He is terrified of the surgery and arrived for appointment at hospital and had 210/110 bp there, the surgery was cancelled. Next day at Md he was 167/93. He wants to know if he can get alternative with Artemesen drug?