Yes. Never work at a job that you don't enjoy.
(I have quit so many I can't count.)
Exercise the parts of you that are not sick.
Hmmm. Walking 55 minutes.
55 minutes is too long for a restart.
Is there a way you can cut it in half (catch a ride to the mid-point) ?
Then, take it easy on the halfsey until you don't feel like you did it
the next morning. Then increase by about an additional ten percent of time, not distance. Follow that?
If you can't get to the midway point to start, then
(and this is counter-intuitive)
to the time and slow
Make the walk slower, monitor your breathing, try to get the breaths going all the down to the bottom of your lungs
(It's the poor tops which have been taking the blows over the past three weeks. My, that is a long time to be ill.)
Shoot for an hour and a half and haul along some water to sip on as you go.
Do a day, skip a day.
Do two days, feel what that feels like on the morning of Day Three (skip that day)
Do a day, skip a day, do two days.
Do that until doing two days doesn't feel like anything on Day three.
Then do that Third day. (It's a breakthrough)
Then do two days, skip a day, do two days, skip a day, do three days. ....
Increasing only about 10% either of effort or time (don't bother about distance, that just arrives) as you feel better.