why am i so tired all the time?

i’m 18F nearly 19, 5’7 idk how much i weigh its somewhere average. i have anemia and a vitamin b12 deficiency, ptsd and apparent depression (i dont think i have that though) and i get psychotic episodes but that probably doesnt really mean anything. uh i’m white (looking at rule 1 lol) and take no medication. dont drink at all, smoke on occasion. no recreational drugs and UK based

obviously some of those things make you tired but ive had them for years and just recently (within the past couple weeks really) im incredibly exhausted all the time. fatigued, not sleepy.

i had some added stress in my life around easter when my mam was diagnosed with stomach cancer but it still seems too long ago to be a cause of this fatigue

advice, answers, anything would be appreciated