Claustrophobia, claustrophobic

I can't handle this. I have this anxiety in me that makes me want to jump and scream so bad. I feel like I am still panicking and my heart is still pounding. I can't handle it when I feel so crammed. I mean tree decorating was fun, but inside I was feeling so overwhelmed that things were everywhere and so squished together with no room to breathe or walk. I like it when there's a large crowd, but it's just at times I don't feel right. I feel like panicking right now and I don't know why I can't settle down. Help me, please?