I doubt anyone will agree with me but this is just my opinion. I suggest talking to your doctor again or maybe a different doctor, explain to him/her your health problems that affect your dayshift job performance. Ask the doctor if there is anything new available (drug/treatment) that could provide significantly greater relief from the dehibilitating symptoms you described. It never hurts to ask. If this leads to a happy outcome then you can go back to your preferred day shift schedule. Hopefully. If this results in a "no,sorry there is nothing out there we haven't already tried on you." I would of course try the suggestions here that you like the most. Good luck!