I have to fast for 55 days. this is not an option.
starting weight 231 goal weight 175
Seems like your reason for fasting is just weight loss, and judging by your past results that hasn't been enough to motivate you. In other words, you really don't want to fast, but it is merely a means to an end.
My suggestion is to forget about Pizza, and start eating more fruits, and vegetables, and drink green smoothies. Do this for a couple of weeks.
Then shoot for fasts that are more reasonable to build your confidence.
Yes, I know it isn't what you wanted to hear. Sorry.