Have you had treatment for lower lumbar degenerative disc disease?

I've asked in pain management, but no answers yet. All discs in my lower lumbar L1-5 are in bad shape. My options are 4 weeks of therapy and brace to see if that helps, if not, then spinal epidural, if not that, nerve ablation, and surgery is in the equation, but he feels I am not to that point yet. Anyone had the injections or the nerve ablation that can share information? On a level of 1-10 my average pain is 7-8 and can elevate to 10 when I am running errands and housework. Should I skip the therapy and go right to the injections or nerve ablation for more relief though the pain will come back sometime and require more shots and ablation. The pain is in its 3rd year, and I'm at my wits end. Anyone that has had any of these treatments or even surgery? I don't mind the therapy for the 4 weeks recommended, but also don't want to get into therapy every week the rest of my life. My PA said after 4 weeks we would reevaluate and if therapy isn't working move on to another treatment. I'm holding him to that. Anyone that can share their experience also about spine fusion?