so for the past month all ive done is think about my breathing and its causing me to feel like I cant breathe, I can never get my mind off it. it either feels like the oxygen isn't going down my throat or someone has a pillow over my face or im forcing myself to breathe and if I don't control it i'll stop breathing. I also get dizzy and tingling sensation all over my body. I've been to the ER twice and they took blood and did chest xray and ekg and everything came back normal. I thought that would put an end to constantly thinking about my breathing but it didn't. everyday feels like a battle to keep breathing. can anxiety really cause this???