where is my heart?

i really want to study. the test is just few more days and the exam is just around the corner. when i open the book and take my pen, my brain will stucks soon. i also don't know why??? my back is pain, my neck is feeling uncomfortable. what happened to me? is it the last pt i hurt myself? yesterday i went to cooking. i nearly cut my finger, luckily, it was just my finger nail. now, my finger nail lost a edge already. when eating dinner, i accidently bite my tounge. OMG.... never mind... now, the problem is how to make me concentrate in study????