Welcome to Psych Central (PC) corkscrew. Sorry to hear you have been suffering from symptoms that make test taking difficult. Many people here at PC go to a psychiatrist and get a diagnosis and meds.
Personally I deal with stress through meditation, exercise, yoga and music. Getting sleep may be the single one thing that keeps me in balance. If you are not sleeping or having bad side affects, contact your psychiatrist and tell him what is happening so you can make adjustments.
Some people at PC will find a therapist will also help them sort out the roots of their life.
Many people find compassionate, caring people here at PC. Some people find the forums give them the compassion and empathy they seek.
http://forums.psychcentral.com
There are articles that go into more detail about coping
http://www.psychcentral.com
Please feel free to private message any of the Community Liaisons by left clicking on the name in blue to the left of their post) for questions or just to share.