How can I relieve severely painful toothache from decay & exposed dentin?

A cavity formed next to a filling & decayed all around it. A month ago it came out, breaking my tooth & exposing the inside. The pain is so bad that only oxycodone dulls it. With 1/3rd of the tooth gone there's no 'hole' to fill with DenTemp.

After 2 days of rapid worsening, it peaked 3 hours ago. It may be the most severe pain I've ever felt. I tried to scrape out the "bad" dentin, flush the area, use benzocaine tooth gel, take extra oxycodone & advil. Idk what to do.

Please don't say "just go to a dentist". I WANT to but have no money, credit cards, or anyone to borrow from. Dental schools here only discount for cleanings. No dentists here will do emergency payment plan (one does a sliding scale but the lowest price is still too much, & theres a 6 month wait anyway). I have state healthcare/Medicaid but even in emergencies, they only cover tooth pulling PROCEDURE (not the anesthesia, x-rays, etc).

My dad can pay for 1 dentist visit & a filling for now (for one of my milder cavities), but I think this one needs a crown or root canal which is too expensive. But it's 3 AM Sunday morning & my appointment isn't til Tuesday 5PM anyway. I'm shaking and crying in pain & if I tried to take enough of my pills to relieve it, it'd be too much & I'd run out early! There must be some way to put me out of this misery! Please help!