If you scheduled a nerve block on the right, it would give you some certainty and space to decide. The nerve block is just an injection of a numbing agent like lidocaine and a corticosteroid. It's a fairly simple procedure but has to be done with imaging usually fluoroscopy through a pain clinic.
I suggest this partly because you are understandably in a hurry to get rid of this pain.
Usually these osteophytes develop because there is excessive movement in a joint. At L5-S1 it complicates the movement of the vertebra above.
An artificial disc would preserve motion and the lumbar discs above.
It is harder to make these decisions while you are in pain.
I do think fusion, an artificial disc, or osteophyte surgery would take the pain away. I also think that a nerve block would work in a temporary way. But, I'm not a medical person.
Bless your struggle. Keep posting.
A chiropractor might be able to perform a palliative manipulation.