it is kinda a low dose don't ya think? can you get more? i would suggest 1-1.5mg if you have no tolerance.
But to answer your question.. yes .5mg will help a *little*
You are a better off than myself right now. I would take the ativan and perhaps drink a beer or two to enhance it since it is all you have. If you do decide to drink, do not overdo it on the alcohol.