I woke up this morning and I felt extremely tired even though I had slept for 8 hours, I got ready for work and my eyes felt really heavy, It has been about 2 hours since and my heart is almost pinching as well as racing and my skin is almost numb, I have gone from sweating to freezing and I feel slightly sick to my stomach. My entire body feels almost as if it is vibrating my hands are uncontrollably shaking. And my back is aching right below my left shoulder. I am a bit nervous as to what this is and the numb feeling in my skin is new but I have experienced this more then once. I just really need to know what is going on. I have eaten and I may have issues with my blood pressure. I am also 19