Have you been to your doctor yet? you should go. There could be so many reasons for this and there should be lots of available help too.
My son is 21 and has been on lexapro since he was 18. He inherited this anxiety from me...so I took him to see a dr and put him on 10 mg lexapro and has been doing great since....he is now handling things better, he's been more positive and enjoying life....I did'nt want him to suffer like I did when I was his age....but I left it up to him to make the decision on wheather he wants to be on medication or not....
Good luch