First, congrats on your surgery.
Secondly, it’s quite common for emotions to be a bit up & down. You’ve just had pretty major life changing surgery. Plus you’re unable to turn to food as a source of comfort now if you were someone who turned to food in the past when you were feeling emotionally unsettled.
Thirdly, we all heal differently. Some people are able to get back to work & their usual routine more quickly than others. I returned to work after 4 weeks & struggled: tiredness, sluggish thought processes, etc. A friend went back after a week & was fine. Maybe you could return to work in a part-time capacity to begin or do some work from home like prepping for future trips, reply to emails, complete paperwork, review docs, etc. & see how you go.
Give yourself permission to take it easy for a little while as you recover. You will get back to your old life. Well not exactly your old life. An improved version.
