Hi, I've been dealing with mostly mild, sometimes severe anxiety and depression for almost past 6 years. For the first year I've been on Zoloft and Xanax for a year, and then succeeded in enrolling into college and getting off them. Unfortunately, last year, which was probably my most successful and best year of my life, one day I randomly got out of breath and it became hard for me to breathe. One day later I went to ER and they said all tests came clean and it's definitely anxiety/panic attack. Two weeks later, I had the most intense panic attack ever, I couldn't breathe at all, my legs and arms went completely numb and I fell to my apartment's floor. My girlfriend called ER, they took me to ambulance and again they said everything is clear and it's a panic attack.

Since then I've been dealing with a continuous anxiety, and I've been again put on Zoloft and Xanax. I've been mostly okay since then, but month and a half ago when one of my friends died in car crash, I've had an intense anxiety episode since then. My symptoms are mostly chest tightness and discomfort and also feeling like I can't get a full breath.

So in order to relieve myself a bit, I started taking Xanax daily for the past few days, and I've been feeling a bit better. But I was wondering, how often can I take Xanax in a row without becoming dependant or tolerant?