It's good to hear you are coping OK back at work!
I completely echo Diamond above & if you can take a few breaks by getting up and moving around a bit at work, that can really help too :)
Don't ever be afraid to call your CRS up if you need some reassurance. After my op, I went to my GP quite frequently just to get them to check the wound was healing OK and there were no signs of infection - this was just for my peace of mind and it was also really reassuring at such a stressful time. There's going to be a few things you notice as you go through your recovery. It sounds like all is normal though, so stay strong! You'll get there :)