Spinal fusion

Deffy19, hi, I'm in two minds as to whether I should speak of my experiences because it may be totally different for you. 
I've had five operations on my spine. I have spinal stenosis, spondylolisthesis, my discs keep herniating etc. 
My first operation, in 2008 was a laminectomy. In 2010 I was advised by the neurosurgeon to have a fusion, in the L4-5 region. This went ahead in January 2010. I'll be honest. It was very painful. I kept saying that something wasn't right but they sent me home anyway. Eventually I had an MRI Scan which showed that I'd been right to be concerned. One of the screws had come off. I wondered whether I was the only NHS patient to have been sent home with a screw loose - literally!
Anyway they had to re-do the operation in April. There was a long recovery period.
Then in 2012 I had another laminectomy, in L4-3. Again I was sent home but became very ill. I was re-admitted and a scan showed a blood clot in my spine. Which is never a good thing. They used a huge needle to draw it out, without any anaesthesia.
By 2014 my spine had deteriorated again, despite the fusion. I had Cauda Equina but the surgeons missed it. It wasn't until June 2015 when I collapsed, that neurosurgeons operated for the fifth time. After-care has been terrible. No specialist physio, no understanding of my problems. The lucky animals under the care of Professor Noel Fitzpatrick get infinitely more care than I ever did...
So my experiences have not been great. Now I can barely stand or walk, have to use a wheelchair outdoors, though I'm housebound. In the last six years I've hardly left the house. I need my Carer for everything. 
I've been honest about my experiences but that's not to say that you would suffer the same fate. For all we know the fusion may be the best thing for you. If you do go ahead, make sure that you have support and assistance during the recovery period. Unfortunately I did not and of course that affected my recovery badly. 
Wishing you all the best, whatever you decide to do.