welcome to just answer
are you present online?
Given your symptoms there are a few possibilities in your case -
a sudden rise of blood pressure can cause such symptoms
other possibility can be increase in intraocular pressure of the eye (common in patients of diabetes)
a bvitreous hemprrhage (bleeding in the posterior part of eye)
diabetic retinopathy (changes in the retina due to long standing diabetes)
rarely, the symptoms might not be related to eye, but may be due to a TIA (transient ischemic attack) or stroke
you need to be evaluated by your doctor as soon as possible top rule out the above possibilities and start treatment
Is this condition cause for alarm?
if the symptoms are due to a stroke, then it is a cause of alarm
that is why you need to be evaluated as soon as possible