I also have ADD and was on Addrrall XR (60mg) with Adderrall IR (20mg) and the same thing happened. I know you take Vyvance ER but I don't think Adderall is too different. After a year or so the Adderrall XR stopped working and actually seemed to work in the opposite- I was exhausted all the time and unmotivated. My pdoc stopped the XR and upped my immediate release dosage to about 60 mg a day. It's been great and I like the face that I can manipulate the dosage- I don't always take the full dose since it's split up over the day.

I've heard a lot of people with the inattentive type of ADHD have trouble with the XR versions of these meds, though I don't know why. If I go a day without, I don't have physical withdrawal, but do notice a lack of energy, focus, organization and motivation. But since these are basically symptoms of ADD, maybe they are just more noticeable when there's an alternative to compare it to. Maybe you can talk to your doctor about just taking the Adderrall IR and see how that works.