Not really. Everyone is different dude, but I would be surprised if Pregabalin (Lyrica) had the power to fully overcome the CNS effects of Cocaine. Speaking to the Benzodiazepines, the same. Both of these drugs will likely augment your experience, but they are not going to make Cocaine essentially useless upon you. Numbing of the sense of touch is not a feature unique to Cocaine. There are many drugs analogous to Cocaine like Procaine, Lidocaine, Benzocaine for instance, that do the same thing. These substances are used to cut Cocaine for sale for this reason.
You're not doing yourself any favors. You say in the title of your thread that you know it's good Cocaine. You don't know that and the only way to figure it out would be to have it tested. Even if you do a spot test for the presence of Cocaine, that really doesn't help you figure out how pure it is. For this, you're going to need further testing. It's not likely that you will be able to come to any answer more conclusive to this here on the forums.
This is why we don't generally do drug identification like this. No harm done, but for in the future.