I notice some people are more prone to certain reactions with opiates. When I was in bad pain I was given codeine and wow! Better than any psych med! I only had a limited supply or no telling what would have happened. The effect was just so good and I was non depressed in a flash like freaking magic. Sadly, can't use it for depression because one would build tolerance.

I will stay away from Robitussin, I had to take another opiate based cough med for a while, but it didn't do anything weird to me thankfully! Also if one takes an SSRI and an opiate there is risk of serotonin syndrome.

Glad you are staying away. For future reference, a really good but short term cough suppressant is 85-90 % dark chocolate. 2-3 small pieces and you are cough free for about an hour.