Great job on completing 8 days. I would take one day at a time. Thin people usually do much better with fasts. Most important part is you drink warm water, stay warm and rest. Your body will clean itself using all junk it does not fat only.

In 21 days you can expect to lose 21lbs. That will put you at 124lbs. I think this is ok. You will gain back weight easily.

Keep t up.

Archus