Anxiety?

So my boyfriend has terruble anxiety he would get so sick and start throwing up and wouldn't get any sleep so he went to the doctor and they gave him Clonazepam and today he was acting so different also we were going to have sex but he couldn't "get it up" and I know it's the medicine because it's so so easy for him to get turned on. I'm just wondering if anyone else has taken this medicine for there anxiety.