Anxiety (shortness of breath)

Ok, it's Friday today and since last Saturday night, I have been getting this really weird tightness in my chest and throat. It feels like there is a lump in my throat all the time and I can't breathe properly. I don't know how to get rid of it. I tried praying and asking God to take it away, but nothing is seeming to work. I am focasing way to much on my breathing and it's really really annoying. Sometimes I forget about my breathing and I just let it happen and then when I think about it again, It feels like I can't breath. It is the strangest thing ever. This has happened to me before, but not for a long time like this. I know I did something wrong that might be causing this, but I am trying to forget about it and let God take over. It's just really hard right now.. Is this normal? And does anyone have any suggestions??