Strong urge to stab myself in the stomach?

Now don't get me wrong, I am nowhere near suicidal I just get this feeling to stab myself with a knife in the stomach. It is somewhat like an itch that I need to scratch. This urge frightens me a lot which is why I don't feel comfortable around sharp objects and I need to have the sharp edge facing away from me. I also feel the urge to just peel off skin. I really do not know where these urges come from, but I am terrified. Can anybody please help?