Hey, psychiatrist prescribed me Xanax, at first 0,5mg twice a day but I couldn't do anything besides sleeping after it and had serious problems with vision etc. So now it's 3rd day of taking 0,25mg once a day, and I noticed I get panic attacks after about 20-30 min after taking it.. like right now, I don't feel calm, I feel horrible panic, my heart is racing, feeling weak and dizzy, it's scary.. did something like that happened to anyone ? Gosh I'm so scared right now ;(