Post-Lumbar Fusion Recovery Question

I am scheduled for a Lumbar Spinal Fusion Sept 10. I can hardly wait, the pain I am experiencing is almost unbearable. I consider myself to have a high pain threshhold, but this is absolutely the worst. Limited to 2 hydrocodoneNorco tablets per day, plus advil. And lots of ice packs. It will be an ALIF surgery, as my L4 vertebrae has slipped on L5 and they have to stablilize my spine from the front with the spacer before putting the rest of the hardware on thru the back. My lower spine has an almost 90 degree slope to the abdominal wall. QUESTION: has anyone has this fusion at this location before (L4-L5), and how did the recovery go? Pain-wise, activity-wise, what to do, not to do,etc. Give me all your thoughts. Thank you in advance!