Hello – 29 year old female. Labs are normal except low vitamin D. I’m 5’5, 110 lbs, generally eat healthy. I’ve been having back pain in between my shoulder blades, one day I did have a dull achy pain down my right shoulder and arm, I get these spells where it’s hard to breath, my heart feels like its beating fast and I get really warm and hands get clammy, I also begin to feel very nauseous and feel like I could vomit. Please help. I don’t know what this is that I’m feeling. I also feel the need to take a deep breath about every 5-10 minutes.