Being i suffer anxiety and it makes me feel sick every day how my ever going to know if i'm really sick or not? it's like i'm fine if i'm busy yet i like being alone and when i am it's horrible why is that

You nailed one way: There's other great clues too, but you hit one right on the head. If you are fine when you're busy - it's not likely to be a 'serious' illness. (Note: there are important exceptions - so a periodic exam is a good idea) They do not disappear and return for a circumstantial reason that you can actually turn on/off like a light switch. Consider a good CBT therapist for understanding and managing it.