Daily dosage symptoms and conditions

I have been taking Lisinopril 10 mg for over 3 years to regulate my BP. That is just fine. However over the last 3 months I have developed a pain in my left shoulder and rotater cup. I am going to chalk this up to a change in the brand of Lisinopril since I had no issues before changing to the 90 day supply for $10.00 vs what I was getting before. Looks like I might have gotten more than I bargained for.

The pills I have right now have the RX 533 on one side.

While taking daily dosage of 18mg increasing to 20mg after 4 days (regular increase of 2mg) I experienced a sudden blackout lasting approx. 5 minutes. I am 58 years of age and had never passed out before. The reason was bradycardia and a drop in BP, from a norm of around 125/85 to 95/58. BP and pulse rate normalised in four days but dosage not increased since. No benefit yet found in dosage of 20mg. Slight nausea and insomnia also experienced. Wondering if I should continue; following advice of GP but would really prefer a homeoepathic remedy if there were one available!
Sincerely,
Rita Hudd