This comes from a doctor/health care investor I used to work with. He went to Harvard if that adds any weight, but I really do not personally vouch for the medicine/science behind this. I'm a finance guy, not a doctor.

First, get a decent inversion table.

Then, each night about 20-30 mins before bed, take a robust amount of ibuprofen and drink some water. Wait for about 20 minutes for the pills and water to get into your system. Then hang upside down on the inversion table for a few minutes or however long you can. Go directly to bed after the inversion table, but drink a bunch more water before laying down.

The idea is reduce inflamed discs with the ibuprofen, then pull the vertebrae apart to allow the un-inflaming discs to return to a not pinched position. Then overnight the discs hydrate, helping to hold in place (?).

Regardless of how it works, I felt a difference after one night, and after about a 10 days of doing this (and I wasn't even managing to do it nightly) I was completely fine. No problems since then, maybe 10-12 years ago.

Worked for my friend (he heard it from a med devices company that does spinal stuff), me, and another family member.