Hi. According to your statement of description, it shows you have piled up so many problems that you have encountered. For past 3 yrs you had  discomforts and frustrations which made you low and it has gradually increased your incapability in mind and heart. Giving up Ur self concept and knowing not wat to do is the next stage. If u had any bad experiences in Ur life or if had any critical and abnormal situations in your life , then the past may come now to you as nightmares. Also not just this one reason but many causes could be there. Until getting a detailed history from you , we may not fix your problem. So you need to see a clinical psychologist where they analyze and provide a solution to your issues. Or also feel free to contact me.