Vent/ need advice

I've had tourettes since 3rd grade and been on Keppra for it since 4th grade, however, I turned 18 and got taken off my insurance so I can no longer afford the medicine. I've been going through terrible withdrawals without it; shaking horribly, panic attacks, I can't sleep, and everything is just miserable. I'm so exhausted of this and I'm just so stressed out from it; does anyone have ANY advice on how to get over the withdrawals? Thank you reddit.