It is always a risk that in times of high anxiety we will "fall off the wagon" no matter what the addiction is... including self mutilation. Since you did some serious damage, a visit to your doc is super necessary. You have nothing to be embarrassed or ashamed about. They are trained in this and may very well have seen much worse. Talk to them about what changed in you that put you back into this old form of coping. If you were "clean" for many years, you can get that way again!!!