When you are mixing Benzodiazepines with Alcohol, with muscle relaxants with, with Cocaine, the safety issue becomes very difficult to safely advise upon. Benzodiazepines and Alcohol increase each others' effects. Alcohol and Cocaine produce a third psychoactive drug in the body, Cocaethylene. The muscle relaxant, I'm not really sure about, but if it's something like say, Carisoprodol (Soma), then that further complicates things. At this point the only thing that I consider safe is for you to advise yourself. I think we could give you a range of different advice, but it's gonna be really difficult to put our finger on what is truly safe for you. You say you are "highly tolerant" so I'm guess you have experience with most of these things.
I think you should definitely not ingest anything else for a few hours and see how you feel. If you are still having trouble sleeping or something, then you can reassess the situation then.