Back pain. Super bad

Hi mommies this is my first pregnancy so I really don’t know what’s going on. These past few days I’m very stress. I’m doing this all alone. My back hurts. Upper back. Feels like behind the chest . It’s hurting so terribly. And I can’t help but to cry because of how bad it hurts. I’m so worried it’s something concerning. Please advice. I want to give up . I’m only 18.