Hey man, good to hear you caught things in time without doing yourself permanent damage. Had a health scare recently too that had me getting brain scans - luckily it turned out to be nothing more than hearing damage and tinitus (which is bad enought but not life threatening). Every now and then I get prescribed Xanax becuase of stress at work and this can impact on my ability to fret the guitar accurately - when that happens I just turn the light off and play by feel. I don't look at the fretboard at all or think about shapes or chords - just work around free style. Its very therapeutic and actually helps me to relax properly plus it has added a new dimension to my style. Not sure if that's what you're looking for, hope you get back on track soon.