I know it's scary, so now it's time to address your anxiety. It appears you've ruled out other causes and anxiety can, and does present with these symptoms. Therapy helps which can be a lengthy process and often medication is needed in the meantime. There is help, you're not alone, and you always have us to talk to. But seek help so you can start to feel better. I wish you all the best and take care.
You are definitely not alone with this. It is scary and confusing, but you can and will get through this. Do you have access to counseling? I would have to agree that confronting your anxiety will give you the ability and tools to get through it...keep us posted!