You have pointed out your mother is in charge of doling out your meds so I am guessing you are relatively young.

If this is the case, and she is being selective over which meds you get, you need to talk to someone immediately. Call your psychiatrist or doctor.

If I am incorrect and you are much older you need to get up the courage to talk to mom. Obviously she is not going to see eye to eye with you and be 100% agreeable but it is possible to for the two of you to make concessions. Instead of being a lockerheads perhaps there is a middle ground.