Hi Maggie,
First let me say welcome to the group. The people in here are very supportive, and often have some helpful ideas on how to manage/cope with the ordeal that some of us find ourselves in.
Secondly,if your circumstances allows it, don't hurry back to full time work too soon. Just ease yourself back into your work routine slowly. It depends on what your treatment regime was too.
I returned to full time work a little over two months after my hysterectomy for endometrial cancer. Nearly four months later, and I am finding that there are days where I just seem to have no oomph.
Some of this may be due to my lack of sleep (I am thermostatically challenged at the moment), but it is also because my body has just been through the wringer and is trying to sort itself out again.
Good luck with your return to work, but please keep in tune with your body and don't push yourself too much.