What you are going through is normal. More things can trigger the feeling. You may feel cuts being made when it isn't happening. A lot of times if I'm really struggling if I look at my arm I start to see blood flowing down it. My wrist will ache, like the feeling a few days after I had done a lot of damage. At one point my arm became paralyzed and the muscles started cramping when I was having major cravings (I don't know if that is common at all, and my doctor said it had to do with my Conversion disorder, my body reacting physically to things that are completely psychological). My point is, sever craving is definitely normal, even to the point of having physical symptoms, or what feels to be physical symptoms.