Is My Mother Crazy? or Is Her Behavior in the Realm of Normal?

Trust me, it hurts so much to say this, but I think my mother is a bad influence on me. I am 20 and go to college FAR from home (my parents pay minimal bills and I am very financially independent for a college student). I have 4 siblings. Sometimes I won’t turn on my phone for a few days because I need zero distractions, and when I turn it on again there is always at least one message from her asking why I haven’t called her. Once she even called the police and had them find me! I am openly gay, and ever since I was a teenager my mom treated me like there was something wrong with me (taking me to numerous counselors and crying and saying that I’m going to become a bad adult… yes, seriously). When I come home, she is always very loving, but the most recent time she went through my stuff and found a prescription stimulant I take responsibly and under a doctor’s supervision. She accused me of being addicted to methamphetamine (which I’m not, the prescription wasn’t for methamphetamine either) and that I had put methamphetamine in some B-vitamins that I gave my sister (which I didn’t). Sometimes she makes me feel like there is something wrong with me, like I should call her all the time and not take prescription drugs (even though they help), but then other times I realize that this is a ridiculous idea and that my mom is a bad influence. Sometimes she can be downright mean, like when I was in elementary and middle school she would lock, yes lock, me outside and make me jog around the neighborhood because she said I was too fat. She has toned down now that I am older, but I think her behavior may be a sign that she is not sane. Is this at all normal? How can I get her to stop? I already avoid going home as much as possible, but it’s hard cause I have no money….