I have that same problem (I barely move and its high). Mine is from taking Advair though. My HR goal when working out used to be to stay over 65, and I would max out at 98. I got off the meds, and I've been taking magnesium everyday to lower my heart rate (since I don't eat a lot of beans or nuts on a daily basis). Its working real slow. Instead of my HR being 168 when carrying things up the stairs, its now 138. Welbutrin is really bad for your body. I used to take that with the Adderall... It had me looking like a heroin addict (which I wasn't, never done drugs). The weed is bad too.

Good luck getting it down.