I was on propranolol for 3 years for mitral valve prolapse and hb...

I was on propranolol for 3 years for mitral valve prolapse and hbp. When I developed symptoms of hypothyroidism I finally convinced the dr. to take me off it and I was put on 20 mg of lisinopril. My thyroid function went to normal range after one year but after 2 years the symptoms are returning. Has anyone seen a connection with this medication and thyroid function. I'm having twitches, cramps, indigestion, some lightheadedness, cold feet, tingling in hands, increased ringing in the ears.