For awhile now I've been noticing that when I stand for more than a few minutes, I start to become uneasy, my heart begins to race, and I feel sick to my stomach. These signs worsen significantly if I have my arms raised above my head. I am only able to stand with my arms raised no more than a minute before it becomes too much for my body to handle and I must sit down. I know this sounds a great deal like anxiety, but if that is indeed what it is, why is it brought on in these very strange ways..?