So, I too get nasal irritations from time to time and I swear by Neosporin (it's sometimes sold in a generic triple antiseptic ointment). That stuff works overnight on me, it can actually close an open cut in 8 hours. I would highly recommend it if you're going to continue snorting stuff.
Thanks for the tip, but I'm in Europe and we don't have Neosporin here, plus it is an antibiotic and here you can only buy antibiotics with recipe. And also it could be a bad idea to use this frequently, you know because abusing antibiotics.
But searching for alternatives in Europe I've found Bepanthen / Bepanthol nasal, which is used to avoid nasal dryness and irritation, not the same as Neosporin, but I will be trying it, maybe my problem is lack of nasal hydration.