Could someone check my English?

"describing symptoms as well as statistics" "Using the DSM test, we will assess Alex" "disorder because he had a car accident." "As for him saying he sees himself differently prior to the accident, it could be due to the horror and helpless feelings he carries and the threat of death he experienced the moment his car hit." "He may have felt worthless and was unable" "leading me to conclude that he may have" "and as a result" "link it with the nightmares" "due to the upsetting thoughts and the flowing of the blood from the accident popping into his mind the moment he lays down on his bed." and the death of his loved ones."