Returning to work was a major target for me for each of the 3 times I was off sick long term from work.
Being at home long term sick may at first feel a little bit like a holiday, except for the pain ! However after a few days I would feel like I was worthless and not contributing anything to life. I would watch people out of my windows getting on with life. It occurred to me that the world still continues, even though I am stuck inside.
Unfortunately for me, I was off sick because one of my problems was lack of mobility. So I wasn't even able to go out for a walk ! I also couldn't drive because I was on extremely high doses of painkillers.
So the advice I would offer to others is that returning to work is a good thing. It means you are on your way to getting better. You will be around people you know, and it will make you feel worthwhile and normal again.