Struggling with Pain and Loss of Motivation – Seeking Strength Through Faith

Assalamu Alaikum everyone, I'm not sure if this is the right place, but I'm feeling really desperate and deeply down. I hope you all can share some motivation or advice because it feels like I've completely lost mine. A little about me: I'm a 37-year-old man dealing with depression and borderline issues. At the end of 2020, I got sick-not from COVID-but with a herniated disc and several disc bulges from around my mid-back (nipple level) down to L5/S1. Last May, the doctors fused my L5 and S1 vertebrae. The surgery went fine, and I'm still healing. Last week, my surgeon told me that despite the constant, heavy pain, I need to "push through it" and do more rehab. Right now, I’m only doing about an hour a week, but he recommends 4 to 5 hours weekly. I told him the pain really limits my movement and life, but he still advises to keep trying. He’s a very kind and professional doctor, and I understand where he’s coming from. I have a fitness plan and everything, but if I go to the gym once, I have to rest for three days because the pain flares up badly. On top of that, my motivation seems to be gone. I weigh 200 lbs (96 kg) and I'm 5'7" (173 cm). Before I got sick, I was fit and healthy, but now my spark feels gone or at least heavily dimmed. How do you all get through tough times? What keeps you going? I've started praying more and trying to put my worries into Allah’s hands. Please share any advice. I'm really tired. I know no one can do this for me, but it's so hard and feels so unfair. Sorry for the long message. I pray that you all stay healthy and well. Jazakum Allahu Khairan.