Not OP but Vyvanse is a miracle drug to me. It's a stimulant, same as Adderall, but a prodrug. Your body processes it into dexamphetamine so it is much smoother with little side effects.
I am too, and mostly feel the same way. I have only been on it a few months though. How long have you been on it? Do you worry about long term side effects? I notice my heart rate is faster all the time though, but my cardiologist said not to worry.
Damn, one day, when it is available somewhere near me ... right now only people in my country that know Vyvanse (or Elvanse) are foreigners lamenting absence of the one drug that makes them function.