Hair Shedding Help! πŸ˜’πŸ˜©

Pahoua
I would like to know if there's any hair products to help with hair shedding. Everytime after showering, I get almost a handful of hair. When I mentioned to friends and family about it, they usually assume that women who've got kids tend to experience hair shedding but in my case, I'm not a mother yet (a proud auntie!) lol. Does anyone know what the reason is? My mom said hot showers could be reason why I'm shedding. Stress? I've tried some vitamins to help and tried most of the shampoo/conditioners in drug stores and none of them seem to work; even tried "OGX niacin & caffeine" and that didn't work too. my scalp started to itch and got bad dandruff from using that πŸ˜’πŸ˜’πŸ˜’ should I see my family doctor? A dermatologist? Any help at this moment is needed and appreciated! TIA πŸ’•