They likely gave you something they gave me before when my acid reflux was out of control one night- a GI cocktail
, to drink? If so, it has a mixture of medications, which I think includes lidocaine to numb the pain.
In answer to your question, yes, anxiety can cause skin rashes (see private message for more info).
Hormonal imbalances, for instance of the thyroid, can cause a person to have emotional disturbances- have you had any endocrinological testing?