Certain medications can cause side effects in many of us that take it. Vyvanse is a stimulant, which in my experience actually helped me focus in the long term (I took another type in the same class) Initially, I was nervous about taking it because I thought it would make my anxiety worse, but these types of medications can "calm the mind" with those with ADD or ADHD in my experience with them.
Have you talked to your doctor about it? Sometimes, just adjusting the dosage can help tremendously. With me, my doctor lowered my prescribed dose ever so slightly and it pretty much helped with most of the side effects....keep us posted!