I’ve just stopped taking blood pressure tablets which were prescribed to me two weeks ago the side affects were horrendous I’ve never felt so dizzy and weird, if you can give them all up i would, I sometimes find the so called relief is worse than the original condition beetroot juice and garlic capsules for me now they are meant to lower blood pressure.
As for your back can’t you try and get to see an osteopath for some pain relief, I remember years ago I had a back issue and some infra red heat and a bit of manipulation done my back wonders.