12 weeks pregnant, feeling dizzy, faint, having headaches, fatigue, and weak? i almost fainted and my vision was black and blurry?

Pregnant, headaches: Blurry vision in pregnancy most often due to hormonal changes causing unstable tear film/dry eye. Also check your blood pressure & urine to be sure no concern for high BP or pre-eclampsia. Start non-preserved artificial tears 4-6 times per day do not help (& lid hygiene: see eyedoc2020@blogspot.com), Also see your OB & your eyeMD as soon as you can.