You can go to a physician and describe symptoms of no sleep, panic attacks and dread. Freezing up during tense moments and crying with very little provocation. He may give you enough until you see a psychiatrist who will then better assess your condition.
If you mean illegally, there are thousands of online pharmacies that sell Xanax without a prescription. They’re usually located overseas and most of them are a scam, plus buying 30 1 mg can set you back nearly $200.
It’s a highly addictive drug and hell to go sober from. I recommend you don’t do it unless a doctor monitors it.
Only via prescription. Even if you find someplace out of the country to sell it to you, it would still be illegal in the US or Canada without a valid scrip.