I recently told my supervisor that I have ADHD and from there he started scheduling me one day a week right now I work one day this week and next week I'm scheduled to work one day

If you have a specific question arising from this set of facts, I would be happy to try to answer it for you. Otherwise, unless you or your doctor specifically advised that you required less hours as accommodation for your ADHD, then this could constitute discrimination in the workplace and/or a constructive dismissal. I suggest reaching out to an employment lawyer at the number below in order to discuss your entitlements and rights.