well congratulations to you on what you have done! Way to go. Be sure to try and end it right and try to change your diet for the better too. As other's said.
I also have immune probs & my DR told me that I should do shorter fasts of about 3 days instead of longer ones. Last time days 6-9 were brutal on me cuz I was dumping so much. So it may be easier on the system to let go in micro bursts instead of a big dump? You may be different? One of those fasting gurus has only water one day a week as a mini-fast. I think any break you give your body will do some good. For people who have a more toxic condition, or serious health issues, we may need slower mini-fasts building up to a longer fast.
I will recommend you take as much vitamin C as you can once you're all off the MC. I've been taking 10,000mg a day and it's kept me off the prednisone this time. yay.
You still did really good for yourself! Congratulations. :)