I would suggest supplementing with Calcium and Magnesium, both important components for muscular contraction. Depletion of these can happen when the sympathetic nervous system is activated for long periods of time.
I would also recommend supplementing with Taurine, which is also depleted when taking amphetamine salts. It may also help with focus, but not in a way that may be noticeable when taking aderall.
Also, if you are sitting at a desk all day, studying or working, then this will also contribute greatly to this lower back pain.
I would try out these supplements, and also try out stretching a few times a day. Keep us posted.