(1) I don't think it's a "few hundred" who've found they can't afford the costs of keeping a car or 2nd car, I think it's in the millions, US-wide
(2) Yeah keep your car for a while, a month or two or three, and do without. You'll know by the end of 3 months whether you can do this.
(3) There are hardly any human beings who can't at least bicycle at a walking pace. At a walking pace, on a "cruiser" type sitting-upright bicycle, with a decent low gearing, you're using very little energy. Much less than a walking person, so that a 1/2 hour on it won't tire you out they way 1/2 hour actual walking will. This is a great "on ramp" for those who are overweight, unfit in general, or psychologically unprepared to ride a bike quickly. Gradually you'll work into it. In reality, what feels like a "walking pace" on a bike is more like a jogging pace or even a runner's pace. So don't worry about it, get a nice comfy bike and ride and smile!