I have much experience with fasting, it seems to be my "gift", but like you, I don't talk about it much. It is not the gifting of those whom I am in fellowship with or with anyone else that I know. So, it's a personal thing...but I was drawn to this thread.
I started experimenting with fasting 16 years ago. Back then, it was for health issues. But now, God will call me to fast, most of the time I don't know why, but sometimes He shows me. I used to struggle with that, but then I gave that to God too. I figure, if I need to know why, He'll show me, and if I don't, He won't. It's His business, not mine...I just need to be obedient.
I don't know what else to share, it's always seemed so personal, but if you have questions, I'll try to answer them.
In His Love,