Also, don't let Google diagnose you. It'll turn you into a hypochondriac. 16 years ago I convinced myself I had a brain tumor and drove myself insane, Doctor laughed at me as I explained why i thought I had said tumor. Never again did I try to be dr Google, the most stupid dr there is.
Also, let me add that our brains are very powerful! If you believe enough you have something or something isn't working or not going to work... It starts to become real and your new reality! Maybe that's the issue and not the medications. Relax your mind and reassure yourself.
dont forget, that if you truly have an issue like adhd that is treated through stimulants, the purpos of said stimulants is to help make you feel "normal" and focused.... Not high... I'm a little unclear what feeling you think you should be feeling that you're not? Tolerance is also a factor.