So, I used to run 4-6 miles a day about 3-4 years ago.  I love running, but I soon became inactive.  But, when I started to become active again, it was impossible to do little exercise.  Even doing 15 squats without weight can elevate my heart rate.  While running, within the first 5 minutes, my heart rate can get up to 200 bpm with the treadmill set between 5-6 mph.  It is so frustrating.  I take an inhaler (Dulera) but it only prevents my heart from beating out of my chest when walking up the stairs... does little help for me while exercising.  Its embarrassing because with little to no exercise, I can get easily out of breath.  If I exert myself for longer than a few minutes, my heart will pound so fast that it the beating is visible with clothes on.  I would say I'm not much of an anxious person, but others tell me otherwise... this could possibly affect my heart rate, but I only have problems with exertion.  Please, if anyone knows anything or is going through something very similar... I would love to know.  I miss being active and loving exercise.