Pain and grip loss hand. Syndrome?

I have enrolled into a post graduation course after 12 years of working. I have to undertake courses/ exams which require me continued writing for nonstop at least 3hrs everyday which I have been out of touch from. In the last exam, I developed a pain including a loss of grip in my right arm and hand, which aggravated each time I tried to write. Further, in a paper , almost after 2 hours of writing, my hand almost froze, and I wasnt able to write. I changed my pen, but it didn't help much. The pain still continues even after a month from my exam and keeps on coming back as i try to write more.  Is this carpal tunnel syndrome? Pls help with your expertise. Doctors whom I have visited suggested NSAID and vitamins , but will they help.