I do this all the time, and have been for years! I have never run into any sort of problems, but I have a very high tolerance to benzos.. I take klonopin, when ever I do coke.. I have extremely bad anxiety as well, and even without the coke I worry about things that aren't even there to worry about.. its terrible, without my klonopin.. with it I am a different person, and feel so much better, like I don't have a worry in the world, I mean if there is something to worry about, even with my meds I still will worry, but its not nearly as bad as it would be without them..
Anyways, yeah, I hate coke without benzos to mix with it.. I wont even do it, without something like my klonopin I am prescribed.. I get wayyyy to paranoid, and just feel like shit the whole time, while if i take benzos, low doses in between lines or hits, when i smoke it, or shots when i shoot it, i am just fine.. not to tweaky, but just euphoric.. Weed also makes it much better, to do coke. I have to say, one of the best feelings ever is weed, coke/crack, and a benzo of your choice, mine being kpins, valiums, and the occasional Xanax.. i used to do coke and Xanax together all the time, before i was prescribed klonopin.. then i just figured, since the kpins work so great, why bother?
So, i think you are okay, as long as you know your limitations with both drugs.. That's how i am with it, if i don't overdo it with either coke or benzos, i feel awesome, throw some weed or THC in the mix and i am absolutely ecstatic, and some MDMA with weed, kpin, and coke... wheeeew! that is one hell of a fun ride! But, a bit more dangerous, than just weed, benzos, and coke.. but i will say, that's possibly one of the best experiences i have ever had! mixing mdma with the other 3 drugs i mentioned, absolutely incredible. Not telling every one on BL to go do it, just stating my experience.