It could be delusional thinking and it could be a symptom of extreme
anxiety. People with extreme fear and
anxiety can convince themselves that they are being attacked by rats, bugs, and snakes. People without any kind of mental illness do that all the time, when they just have a phobia. There is that old cliche where children get so scared that they think there is something under the bed, because their imaginations get carried away.
I don't know that you should be taking clonopine.