It'll take a couple of appointments before you find a good dosage. Don't abuse your Vyvanse; you might lose the script, and besides that, it's a terrible drug for abusing, but it works really well for controlling ADHD symptoms if you take it like you're supposed to. It's a pretty smooth ride, no real crash or anything like Adderall XR, and I find it lasts a lot longer as well.
30 mg is pretty low, I think like 50-70 mg would probably be the ideal dosage for most people.
Personally, I find Vyvanse to pretty mild all around. The elevated heart rate/blood pressure subsided in ~2-3 weeks. I know plenty of people who hit the gym hard and play sports on it. So maybe take it easy if you're feeling your heart bounding or aren't eating enough but once the side effects subside you should be fine.