My scrip is .5 per day. I think the most I've taken in one day is probably 2mg but that was a very bad day. It still works well for me and I haven't had intense anxiety in a while. I have also drank alcohol while taking clonazepam (and Effexor XR). I obviously can't advise you on dosage levels but I've seen members here taking as much as 10mg. I do know that it is very very difficult to have a fatal overdose of any benzo. Last I heard, the acute toxicity of clonazepam wasn't even known.
Hang on and I hope you can get the anxiety reined in soon.