I am a little anxious if someone would give the advice 'just write'. I hope the question is worth answering. The character is a regular corporate employee struggling against acute anxiety. In the state of distress once he took some insider information and used it to trade and made money. Now he is paranoid that someone would get him. Earlier he was shy, debilitated under a demanding authoritarian father. After making the excess money, he didn't know what to do with it. He went to a bar where exotic dancers dance. He spent a lot of money on a dancer and she got hooked to him. He got her an apartment. The first scene takes place in that apartment. How do I write his paranoia? She does not take his paranoia seriously. She complains about the apartment- water, bed sheets, size etc. She abuses a lot which he objects to. But how can I show his paranoia? I am writing a play, so he would need to act on his paranoia. One idea is a phone lying on a table and his obsessive attention towards it. But that won't be enough. I need something more. What happens to a person who goes paranoid externally? Any ideas?