RELATED TO PERIODS

hey so i am 21f and my periods have been irregular lately. I get my periods but they get so late. Symptoms i have noticed so far: - fatigue - a lil belly fat (I've always been skinny) - dark circles - thinning of hair - hairy body - facial hair (not too thick or coarse) - irregular periods - mood swings - cravings idk if it's iron deficiency or pcos. my diet isn't too good either. i crave spicy and sweet food a lot. Have y'll faced the same thing? if yes, please tell me your experience and what i should do? are there any tests that i should get done? if yes, which ones?