Looking for nootropics to take alongside Vyvanse to help with jiteriness & physical and mental tension

I'm prescribed 50mg vyvanse for my ADHD, I've been taking it for around a year now and I definitely feel the benefits, but at times it makes me anxious, jittery and causes muscle tension.
I'm also a daily caffeine user, mainly taking it in the form of coffee and sometimes tea.
I'm looking for nootropics to take alongside it to help with the aforementioned side effects, I want to feel focused and sharp but also calm and more relaxed.
Also bonus points for nootropics that reduce long term stimulant tolerance onset.