My Hair Loss Advice

I’ve been experiencing some serious hairloss and it’s worrying me. I’ve done a little research and I found that having poor eating habits can contribute to hairloss. I really think that is one of my problems because I’ve been yo-yo dieting and i tend to skip meals and not eat healthy foods at all.. so my question is, what foods should I consume that you know might help with my hairloss. Thanks in advance.

I want to know what shampoos help hair loss that I can find at a close drug store like , Walgreen’s, CVS or Rite Aid because Im really young.
Im a teen who’s loosing hair but not chunks but whenever I pass my fingers through my hair I tend to lose some hair. Thank you for your help!