So back in February I got bloodwork taken and had extremely low vitamin d and a few other issues. Around March I noticed that my hairline was receding, but nothing to freak out over. For the past month I've noticed it getting worse and now have thinning around my crown. My mother's father had a full head of hair his entire life, my father's father had a full head of hair for most of his life, but my father and his brothers all were bald. I also slipped into a terrible diet the past few months. Am I doomed or just unhealthy? If I'm screwed, how long do you think I have? Also I'm 19 if that helps.
imgur.com/a/ZdSCIZz
imgur.com/a/ZdSCIZz