I've been on Lisinopril for about five months. I'm a female, age...

I've been on Lisinopril for about five months. I'm a female, age 47 taking 20 mg once a day. My BP was 150/90 but now low at 100/62. Doc says my young age can support low BP for now. The chest pain and leg twitches are the worst. I'm constantly tired and find a lot of times that I just can't think clearly. I often awake at night with arms that have gone to sleep. Not sure though if the symptoms are from Lisinopril or the low blood pressure that it creates. Wish me luck because I've decided to stay on the meds but try some lifestyle changes instead. I quit smoking two days ago but have often gone over a week and then caved for a cigarette. Only smoke about five cigs a day anyhow. Started walking when I quit, starting at a mile first (1/2 uphill.) Technically, I"m not overweight by charts but have never weighed this much in my life before. I"ve always had a slender, tall frame until just six years ago (turned 40?). Also, not sure how much is stress related at every level of my symptoms. Working through a separation and hopefully divorce.. For now doc says stick with this med and lifestyle changes will win out.