Do you get "sick days" at work? Can you take vacation time for sick days? If a Doctor writes a note can you get more days off?
After surgery, some companies in the US require you to have a Doctor's note or form filled out by the Doctor, releasing you to be able to go back to work and stating any limitations you may have. Maybe you can be on light duty for a couple weeks...it just seemed like you weren't able to hold your arms up or sit up very well that long ago!
But I know what it is like to be shorthanded at work and I am sure you are a good employee so they are anxious to have you back...but if you don't heal completely you could be out longer the next time.
Drink some ginger tea for energy !