I'm losing hair incredibly fast, it is hereditary but it shouldn't be affecting me at at this age and speed my dad only lost in his 30s, how to stop?

Telogen Effluvium. Telogen effluvium is a form of nonscarring alopecia characterized by diffuse hair shedding, often with an acute onset. A chronic form with a more insidious onset and a longer duration also exists. Telogen effluvium is a reactive process caused by a metabolic or hormonal stress or by medications. Generally, recovery is spontaneous and occurs within 6 months. B12 shots are helpful.