My hair is getting messy and I feel like doing hair rebonding. Has anyone heard of any risk in doing it?

Rebonding affects people differently. It's not necessary that you will go through a crazy amount of hairfall just because a friend did. However, know that rebonding is a chemical procedure and like any other chemical procedure, it has its side effects. I got mine done two years back and my hair got thin and weak. But the effect wore off after two years and with ample amount of nourishment, I got my natural waves and thickness back. Do consult with your stylist on what works best for you. My suggestion is to immediately Google the brand she mentions and check out its disadvantages.