I Had Spinal Fusion Surgery 11 Weeks Ago. I Continue

I had spinal fusion surgery 11 weeks ago. I continue to feel tired and not up to par. A friend told me there had been a study done on young students who underwent general anesthesia. There was no surgeries involved, just a long term study of the effects of GA. He stated that it was up to 6 months before these young studs felt 100% again. Are you familiar with this study and, if so, could you refer it to me?

Thank you - JOhn