SEVERE ANXIETY

I have an anxiety disorder. And for like more than a week the anxiety has been so strong and unbareable. I'll just be sitting at home doing nothing and all of the sudden I'll have a long and uncomfortable anxiety attack. It's been really hard to eat. Sometimes I get really nauseous, shaky, and lightheaded, and I can't get myself out of the house even to go to school. I have no idea why it's gotten so bad all of the sudden. All of my normal techniques that I use to calm myself down dont work anymore. I'm so exhausted and frustrated and I'm in esperate need for some relief. Please help!!