I was facing the same problem two months ago, whenever is try to sleep my mind doesn't let me sleep my condition was same as you i could not find out and consult my doctor he told me that this is anxiety and depression, I took medicine in which a sleeping pill was included but after 15 days doctor stop my medicine, i did not sleep alone and trust me i sleep whole night now you can also consult to doctor and try not to sleep alone i can relate to this situation and understand what would be the condition of mind if a person couldn't sleep