Hello doctors lately i've been blinking constantly and i have no idea why! i never use to blind but now i blind constantly.

Eye irritation: Blinking is sometimes a protective response by your body. If this is something new, then possibly there might be something irritating your eyes that your not aware of consciously. Dry eyes is a very common cause. You could try artificial tears but I would get an exam by an ophthalmologist to find out definitively what the cause is.