4 days fast

I completed a fourth day water-only fast.
It was a very nice fast and although working in parallel I handle it very well. First time I had such a clear mind! (I thank God for that). It was a miracle for me especially because I have to handle 2-3 jobs at the same time. In my opinion (for my body), it is very difficult to work(full time) and fast together. I weight 65kilos, 1.87cm height. No! fat from my childhood and weight loss because of a aggressive arthritic condition.
During the fast I saw a dramatic relief in my "anskylosing spondilitis" pains. I had made several 3day water-only fasts, a year ago. And always at the third day pains decrease. This time I add a day.(but it was working days and not Friday-Saturday-Sunday). At the third and fourth day I noticed strong heart beats and increase blood heart pressure (all day). Low Systolic and High Diastolic. I don't know if anyone has noticed something similar. I don't know if it means something. ...sting eyes also.
I began breaking the fast drinking juices and now I am at normal diet. And if you believe it from the time I started putting in my body "fuel" after a few hours all my pains came back as strong as before.
I am sure that for my body, a water-only fast leads to a dramatic decrease of inflammation. But this only lasts as long as I fast. Until now 4 days, haven't tried more to know if it will continue. When I begin to eat pains come back rapidly.
sorry for my poor English.
Something that always keeps me strong and fresh while fasting is singing hymns.
God bless you all.