When did you start doing this? Is it preceded by any thoughts or feelings in particular? How do you feel about it afterwards?

Sometimes we just can't bring ourselves to talk about some things I suppose, but if you really can't stop on your own then you definitely need professional help, because it could seriously damage your eyes as you surely know. It's good that you've posted about it. It's a step, but I don't think we can help you much on here.