Oxazepam is a benzodiazepine that would serve that function, but it's best saved for the comedown (as is the case with all other benzos). It's best not to combine cocaine with alcohol too as it forms a much more cardio-toxic compound.
With all that said, it can become a vicious cycle where you wind up with a dependence on both substances. I'd be very weary of introducing benzodiazepines into the mix as the withdrawals are hellish, not to mention dangerous if you get a habit and cease/decrease use too rapidly (it can result in seizures and/or death, just like alcohol - benzos also act on the gaba receptors in the brain).
You said you use infrequently; try to keep it that way.
With all that said, happy skiing! (Also, keep in mind maybe cocaine's just not for you if it causes severe anxiety - no judgement, just a thought).
Be well and welcome to BL!