Hi Davey,
Sorry you are in such a tough spot. Please take Dee's advice to heart. Sounds like you are at rock bottom so may as well head up!
Baby steps. Have a shower. Doesn't have to be some long drawn out showerama - just force yourself to stand under the water. Do whatever it takes. If you are more comfortable taking a shower with your clothes on, do that. This will make you feel better.
Second and probably most important is have something to eat. Anything, order something. Ask your Son to drop something off (don't know if you are comfortable seeing him, if not perhaps he could leave something on the step for you). You could also order through grocery delivery. Don't worry about healthy foods at this point, anything that might appeal even a little bit is good enough (if that's a burger and fries - so be it).
You can't begin to rebuild until you start with this. I get being terrified of people, I get being unable to seek medical attention, it seems like a mountain too high to climb.
Seek help, call a crisis line (again baby steps, this doesn't all have to get done in 1 day). There may be ways for them to help you that don't involve you having to go anywhere.
Are you still drinking?