I was lying in bed with my phone above me then i saw a faint orange/black flash of line directly across my vision this is the first time.is it serious? i recently ate alot of sugar,i have, floaters, astigmatism, anisometropia.stress,7 hours of sleep?

One episode of abnormal color is not a cause for concern. If you phone was on, it could have been due to a colored image on the screen. If the symptom recurs, consult your doctor. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV and Covid vaccines.

You need a dilated eye exam as soon as possible. Your description sounds like a possible vitreous hemorrhage, so an explanation is mandatory. Diabetes and a retinal tear must be excluded, since these can cause vision loss. Do not delay your ophthalmology consultation.