I am sick of nervous until now. I am so afraid of Unpardonable sin. Is there unforgiven sin thinking?

I was already save by Jesus Christ before this happened. I am so afraid to write down all the details. The devil attack in my thoughts and put evil thoughts that might lead to unforgiven sin. I feel miserable, stress,depress, I am crying many times and the devil told me that there is unforgiven sin in thinking but I do not believe because I cannot find it but still my nervous believes satan and trying to control my mind. I prayed to God to remove this fear and give me peace because I love Him and I am afraid of hell. I have difficulty in moving on and my nervous attack me almost everyday and satan accuse me of unforgiven sin and put evil thoughts which I cannot understand if this is me or not. I cannot sleep properly and cannot concentrate in my studies and not happy at all. Satan told me also to find someone same as my personal experience so that he will leave me. It is just a proof that it is him. I am confused and sometimes I am out of control and think I am going crazy about this and cannot remove easily those evil thoughts tormented me. Please help me and include me to your prayer. -Van