If at all possible, don't quit your meds cold turkey. Many years ago, I stopped a med that way, and it made me sick as a dog. Is there a way to gradually reduce your dose to nothing? It would be the most prudent way of proceeding. If you stop some antidepressants suddenly, for example, you can become suicidal. You don't need that right now. You need for someone to be kind to you, especially--and I cannot stress this enough--yourself.
Forget about school for a bit; take that pressure off your shoulders. The school is not going anywhere, and you don't have the psychic energy to tackle that problem right now anyway: your health is problem #1. The first thing you must do is find a doctor. This is possible even without insurance. Hospitals often have endowments and programs to help those without means. Don't be proud; call them all until you find one. Also, cities, states and counties often run special healthcare programs featuring a sliding scale for services up to, and including, no fee at all. You've got to have medical support while you are getting off this med in order to maintain your mental equilibrium. That's of critical importance. You need the support of other people.
Also, try to forget about your family. I realize it sounds harsh, but you can do nothing for them while your own boat is taking on water. You can address that problem later. For the moment, turn them over to the care of God. Pray to Him to give you assistance and strength and to help light your way.
"I feel like I'm facing a giant wall that cannot be broken through."
It always feels that way when we're overwhelmed. If you want to eat a big steak, you cut it into pieces first. Once you attend to your primary problem, you'll often find that the solutions to any lesser problems start to fall into place. (Sometimes the mere passage of time helps.) Write a list of your current challenges from most important to least important, and tackle them in order, one at a time, a little at a time. Just put one foot in front of the other, and keep moving forward. That's the way Sir Edmund Hillary got to the top of Mt Everest.
Time is the means through which God manifests his help to us, so be patient. And remember that adversity is often sent to test and strengthen us. When this is over, you'll be a much stronger person for having endured it. I'll keep you in my prayers.