I have been taking 5mg of short acting adderall for many years now, which has been wonderful, aside from the comedown. I decided to try adderall xr, and the lowest dosage they have is 10 mg, which I don't like as much as the 5mg, but I don't really have a choice. I took the adderall xr for the first time today, and about 25 minutes in, my heart started racing. My question(s) is: Will this feeling go away once my system gets used to it? Or will this happen every time I take it?