Question regarding fatigue

My name is Dave and I was diagnosed with GBS in Sep 06. I was only hospitalized for 2 weeks and have made a good recovery with the exception of nerve pain in my toes, residual weakness in my lips and the to be expected fatigue. I feel fortunate with my progress but am struggling with returning to work in the next month or two. It would be part time to start but I also have two year old twins and a two month old baby. I know everyone says rest is imperative but I am somewhat of an exercise fanatic and want to get back to where I was previously. When I exercise strenuously I pay for it the next day. I wonder am I doing more harm than good? I guess I am still learning how to manage my fatigue. Any advice from anyone?
Thanks.
Dave