Started taking Lisinopril a few months back and it lowered my B/P...

Started taking Lisinopril a few months back and it lowered my B/P way too much. So they half my dose from 20mg to 10mg but put me on cardium twice a day because my pulse was high (up to 170 at one point). I gradually had a B/P that was OK but felt horrible all the time. Blamed it on everything from the weather to the flu. Headaches all day every day for weeks. I have headaches but nothing like this and I was tired all the time and didn't feel like doing anything but laying down and trying to get rid of the headaches. Then the other day I forgot to take my Lisinopril. I felt pretty good that day and my headache was almost all gone! I realized what I had done that night. The next day I took my Lisinopril and back to a bad headache and feeling rough all day. So today I skipped it and again I have felt much better and so far no headache torture. I called my doc who told me to continue my other med and leave the Lisinopril off and watch my B/P. I have also had a rash on the back of my knees for a few weeks and it has started to spread to my arms. I am now wondering if it could also be the med. We'll see! Thank God I just may be normal again in the near future. My kids and I will be LOTS happier!