I was at football practice, and toward the end of conditioning, I suddenly became cold and had goosebumps. Shortly after we finished conditioning, I put a long sleeve under armour shirt on in hopes that I would warm up, but I was still cold. It has been almost two hours and I am still cold (after taking a shower and changing). I also have an estimated 120 BPM (my own estimation), but I generally have a high heart rate. Any advice?