Don't worry. A blocked vein/artery won't cause this symptom.
Eye twitching /myokymia
in medical terms are due to involuntary muscle contractions. This could be due to stress, eye strain
, allergy, dry eyes,Nutritional imbalance or increased caffeine /alcohol intake too.
If it is persisting for more than 2 days, please get a direct examination done by an ophthalmologist to rule out any above mentioned reasons or a neurological one called blepharospasm
All the above conditions are treatable, so look for a solution by having a stress free life or consult at the earliest.
Hope this helps. Take care.