I have had blindness lasting a few minutes to 6 days in only my left eye ranging from half vision gone to the whole thing. Also sharp awful headaches.

AND....?????? You have been to the er, gotten evaluated by an ophthalmologist and/or neurologist and have ongoing care, yes? If not, please ask yourself how 'normal' what you describe sounds, and get taken to er asap prior to permanent vision loss or other deficits.
Check with your dr. Association of visual problems with headaches can be very concerning. This may be a migraine or migraine variant. It is best to see your doctor to evaluate and figure out the best treatment. Many migraines can be treated with specialized medications.