Suffering from Mental problem. Be red!

- I am not able to study properly - fear of failure for my exam - very much negative thinking - i am feeling sleepy and drowsy while studying - i have resigned job and studying for GRE and i got very low score at first attempt but since then in my preparation for the second time i am feeling very much bored to touch books but again i am self motivating. - not able to focus and concentrate - not able to interpret large text while reading and i am feeling lazy - this is very severely occuring and my mind is no in my control - i feel tired all day - i stay in a room all the day while studing - Even though i know i should go out and relax that was not giving any result in making mind relaxed - i am constantly worrying how to crack the exam as it is expensive and find the next job and in this process i am not able to concentrate properly on one thing - even if i concentrate i am not able to my 100% - As soon as i study for 1 hour i am feeling sleepy - when i wake my eyes will be red