Can Xanax And Lunesta With Alcohol Cause Any Side Effects?

I've been on a regimen of 3 Xanax per day (0.5 mg) and one Lunesta (3mg) per night for the past 5+ yrs with no problems. Although I know it's not recommended, I also like to have a beer periodically and so I do. I recently started on diethylpropion extended release. I'm concerned that the combination of all of these might not be so healthy. I don't want to have a bad interaction between any of these. Are there interactions or side effects I should be on the look out for?