Is It Physical Problem? Or a Willpower Problem?

I have been struggling hardcore lately with feeling like I will never get back to the old version of me. The version that showed up no matter what and pushed through, because... #noexcuses. Since being hospitalized for a spine infection last year, I haven't been the same. My back is still fucked up, and whenever I try to push myself, I end up in more pain and feeling more fatigued for days…