See a doctor at once. Make the appointment now. You will need medication and probably a new counselor since the one you have doesn't understand what you're going through. Depression seems to be a rite of passage when one leaves a cult. I needed hospitalization for 2 months for major depression shortly after I left the dubs.
Start socializing. I know it's hard even to get out of bed when you're severely depressed, but force yourself to attend a book club, health club, take a class in something, anything that will allow you to get out among real people.
When you're feeling better, I suggest you consider moving to a different town to diminish the problem of running into former dub acquaintances. Moving to another state or province is even better, if you can manage it.
If you have dub family, contact them when you're over the worst of your suffering. Some may still want to stay in contact with you (on your terms, though, not theirs).
Good luck to you.