Hello, I Am 53yrs Female, I Have Hypothyroid Disease, I

hello, i am 53yrs female, i have hypothyroid disease, i am on levo thyroxine, i have b12 injections every 3months i am on hrt the lowest dosage of prempak c and at night my back and feet burn up and can do in the day too, the gp has given me dixarit tablets for this, i believe they are for bloodpressure, yet my blood pressure is low, i am concerned about taking these if they will have a bad affect on me?