You'd be surprised at how many people to through this. Especially in their twenties. I've been through it, made my first year of college hell. What caused mine was leaving all my friends and family and going to this huge school with a bunch of complete stranger, talk about overwhelming. I never took any medication but seeing a counselor helped TREMENDOUSLY. Once you can get your mindset right, you'll heal yourself. Some people say talk to a close friend, but I was against that because I didn't want my friends worrying about me. Try seeing a counselor, or if you do have a person close you can talk to, do that. Just talking about it really helps, and helps you understand the root cause of your anxiety. And trust me, it does get better.