Through experience I have learned that those who cannot do a Water Fast are the ones who need it the most. If you are very toxic they can be tough. They can also be more difficult if you are thin. But they are extremely healing. Try to detox some and then try to fast again. It will help you if you start your fast (24 hour fast) after lunch on whatever day and end it with eating lunch the next day. This way you will not be without food on any given day.
If you think your problem is parasites please read this post of mine.
I am sorry I did not elaborate more on my previous post. I answered it on Sunday morning and I was pressed for time. I teach a Sunday School class, fifth and sixth grade boys, and I cannot be late or they will get into mischief.