I used to have jittering, nervousness, and extreme nausea. These were debilitating conditions in my life for years. It took quite some time and effort to get them under control, but I was finally able to do so.
The thing with anxiety attacks is that you have to realize that it is almost always self-created. That is, the symptoms that come with an attack cannot harm you. You may think they can, but in reality they cannot.
Confronting the causes of your anxiety is the first step to recovery.