So about a week ago I was at a gym i'm not used to, i try out this stupid nautilus squat machine, where there are pads that come from the front onto your shoulders (like a calf raise) and as im going down, keeping my head up, butt out, chest out blah blah blah (good form) i get this HORRIBLE twinge and spasm in my back, and its been like this for the past week, sometimes i can't even walk standing straight, headed to the doctors soon but anyone have any idea what it could be!?, it feels around the thoracic curve of my spine, but backpain is pretty misleading