I should start by saying I have never really exercised. In my early 20's I was diagnosed with cancer and my health has been a rollercoaster these past 7.5 years. I have been given the all clear now from the cancer perspective. However I've had major surgery removing 80% pancreas and spleen so my body isn't quite the same. I do get tired very quickly and need to pace myself. I am in my late 20's now.
I was a healthy weight (8-8.5 stone) until I was 23 - medication made my appetite grow and my weight increased to 10 stone. Last year I gave birth to my first babba and in November I started the 5:2 diet and am now down to 9 stone. I'm happy at this weight but I will continue with the 5:2 until I'm down to 8 stone so that I have wiggle room and so my remaining pancreas is not under undue stress.
Stats:
Age 28
Height 5"3
Weight 9 stone (Healthy)
Fitness level - very poor
I have tried following beginner all body workout videos from YouTube however the days after I am utterly exhausted and feel like a zombie. I need to take it really slow. I've tried doing just one exercise a day (eg 3 sets of 10 lunges) but it feels like it's not going to achieve anything and it's so little that I don't bother with it 

Can someone help me write a very basic slow programme ?
I need to exercise at home and have a resistance band and 2kilo dumbbells.