Toni, you know one thing is for sure, you are not alone. A car can be a disaster and take every cent mercilessly. It's quite a shock to finally let it go and rely on a bicycle and for those of us in cities, BART and the bus. I've been a bike commuter for four years and the fresh air really helps with stress and isolation. About feeling suicidal, if you can find the right medication, it will absolutely help you to your astonishment. Just a tiny pill and the right psychiatrist will change your life and help you out of your isolation. There are great medications out there now that just elevate your mood to make you feel like talking to strangers a bit and laughing and keeping the horrifying anxiety attacks at bay. Zoloft may even give you back some energy that's been sucked dry by predators. If you have nothing you are eligible for county programs and with enough persistence you will find a doctor. It just takes one visit even at a crisis center that's free. Just call a local hospital and they should know of one. Google something.
You can also talk to a disability attorney to help you apply for disability from the state and from the federal govt. You can get Medicare and Medical to help with medical expenses, the dentist, the optomitrist, the pediatrician. Foodstamps and the foodbank--many of your neighbors are there. Just go to any grocery store around the first of the month, it's all foodstamps. Foodbank volunteers will treat you with kindness and not judgment, don't be afraid, just go.
If your disability is sixty months or expected to be, get Legal Aid to help you to apply for the disability discharge from the US Dept. of Education directly. Your doctor signs it, confirming the sixty months past, present or future.