Hi Dyscat64,
Are you having the L4-5 re-sected, or having an additional level(s) fused?
You'll have to ask your MD about your particular pathophisiology, but in brief, much back pain is caused by mechanical compression on the spinal nerve root.
There are many ways to cope with the pain. "Chronic1008" has much to say that I like. I have had two fusions in different areas of the spine, plus a few other injury-related surgeries related to multi-trauma and I have a SCS which helps~ some days it helps a lot and other days it helps a little.
First, wait and see how you do after your recovery from the second fusion. You may feel better than you do now.
After that? Pain management, chemical and non-chemical treatment modalities, family, friends, faith, and time.
It does not happen immediately.
Acceptance will, eventually, be the key to those who manage to have a fulfilling life and those who do not.
We do not have to like the changes that have happened to our lives, but we do, eventually, have to accept them and embrace our "new" lives.
Many, me included, have had to leave behind our former professions and find new and different employment opportunities.
I have taken a life-long hobby and transitioned it to a new career opportunity. That did not happen overnight, though.
Be patient with yourself; these things take time.
Be kind to yourself and get through your surgery.
I hope you'll write again.