Hi Kath,
Gee, 3 weeks is nothing in terms of recovering from chemo! It does take time (they say at least the time that you were undergoing treatment, although for me I think it took a bit longer!) and you are wise to stick to your instincts on this. I remember my surgeon saying that they usually give people 6 months off work but I was undergoing treatment for 7 so that was not enough for me.
It is a very individual thing and I think it helps to negotiate a part time return if you can. I am very interested to hear if anyone else has any ideas on how to help others realise what fatigue is really like. I found that like you say, if you look ok people just don't understand unless they have experienced it too.
Exercise and eating well are the two things that helped me to get over the fatigue the best. With the exercise I think it helped me to do it daily even if just for very short times at first (just a 20 minute walk, but every day). The main thing is to listen to your body and take things at your own pace. Try not to let the pressure from others get to you. Fatigue is a very valid side effect of treatment, even if others don't really get this. Hope someone has some brilliant suggestions about educating others!
Deanne xxx