Dodgy alcohol in Malia, Greece

2 months ago I think i drank some dodgy alcohol as the next day i was shaking and had a really had hangover, then the next day kept getting waves of nausea and threw up once when i tried to drink again. My eyes were hurting but could be due to stress as I have heard stories of people going blind from methanol poisoning so was stressing a lot about this, so went to the hospital which was not very helpful. When I got home, i went to the optician and they said my eyes were fine. 2 months later I have just started to get anxious about this again. Am I overreacting?