apple cider vinegar is awesome - i use it in all my salad dressings, instead of balsamic. i make it with organic sesame oil, fresh lime juice - and sometimes garlic/cayenne pepper. since your fasts tend to be relatively short, i would think this would be fine to use on or after the second day.
i'm not sure at all about your other questions - there is an apple cider vinegar forum on curezone:
it's not usually very active but there are some good posts that are worth looking through. (i just saw one on hypothyroid when i went to get you that link)
i have a subcutaneous lipoma on my left rib under my breast. i got this at the same time that i got my liver flukes. it does move when i press on it. i was hoping that this fast might get rid of it altogether but if it doesn't then i will have it removed because it just gets bigger and it is right where my bra strap is so it can be kinda uncomfortable at times.