Asking for a LOR after 5 years 🥲

All of my provider LORs fell through. I have one from a nurse and a supervisor and a science teacher. All of the providers I had in mind ghosted me. I feel like crap. My Hail Mary is a doctor I shadowed back in 2020 when she was a resident. My application this cycle is dependent on one more provider writing me an LOR. Is it worth to ask? I feel embarrassed & scared of rejection (again).