I'm assuming you're already intoxicated man, because you're having trouble typing even a couple of sentences correctly. Don't be the guy who thinks he knows better than the drugs because he has used dangerous combinations before and survived. I think you're already deceiving yourself regarding what you can handle. I really can't recommend that you take anything else, as you're already having difficulties with communication. I would advise you to sober up, even just a little bit, then revisit all of this.
Alcohol, Benzodiazepines and Opioids together is about as dangerous a venture as one can take part in. I really want you to consider not taking anything else until you have a more stable frame of mind. It's not a matter of intelligence or foolishness. It's common for users to get intoxicated or to blackout, then not be able to judge their level of intoxication accurately. This is especially true for Alcohol and Benzodiazepines and you have both on the menu.