Why did i wakeup a month ago and i couldn't see detail like i could the day before ?blurred foggy vision hasn't gone away eye doctor couldn't help

See an ophthalmologist: Someone who is trained as a physician and surgeon to look at this carefully. You may need a corneal specialist to look at your cornea closely, especially if you wear contact lenses. They may need to do a more detailed history on you, to see what is causing the foggy, blurry vision. They need to make sure it's not of amebic, or inflammatory origin, or related to thyroid disease. Call for an appt.

Blurry vision: Blurry vision can be due to: dry eyes (most common) {from a variety of causes, mgd, blepharitis}, need for new glasses (refractive error;induced myopia); diabetes, headaches/ migraines; rare issues (increased intracranial pressure/ papilledema, etc. Be sure you went to eyeMD, had full dilated exam, HVF, OCT, pupil check. If all normal, glucose check. Good eyeMD should be able to figure out reason.