I am currently on vyvanse myself, originally 40mg down to 20mg (at my request, was lasting too long affecting sleep). Something I’ve noticed about it in particular is making sure to eat and avoiding caffeine. I get the jitters and heart racing if I don’t eat enough, vyvanse also decreases my appetite a bunch and makes me thirsty (I suggest water as the drink of choice).
This is only anecdotal experience, I also talked to my doc about it and it is being monitored. so as others also suggested, talk to your doc about it too, it’s more important and cheaper long term to get it correct and handled now than not.