Help please?

Basically, I have been picking for as long as I can remember, basically, if it can be got off, it's off and in my mouth so scabs, pimples, sunburn (when it peels), mosquito bites, anything, but the big problem is, I also self harm. now you can probably see what an issue this is. I have depression and am going through the necessary procedures with doctors and things but they can't know about my self harm because I'm only 16 and that confidentiality thing only goes so far as "we won't tell your parents so long at it's not a matter of keeping you safe", and I can't let my parents know. So this is all fine and dandy, I can just keep trying and failing to stop self harming until I don't need to anymore hopefully, and I'll keep digging at my scabs and eating them (I get really pissed off if I lose a scab before I can eat it) and sucking the blood out of them (yes, I have a bit of blood lust too, okay, I am fucked up shush) however, my parents recently spoke to someone whose daughter is apparently going through the same as me (as in they had bad grades and were gaining weight and getting spotty, little do they know, I have bad grades coz of my depression, I'm getting fat because I'm comfort eating and I'm getting a few spots because I pick at every single imperfection) and it turned out to be a polycystic ovary, so now I hae to go for blood tests and an ultra-sound. here comes the dilemma, I have self harm cuts all up my arm and a load on my upper thigh with a few just above the line where trousers cover. I have two days for these all to heal enough to be less noticable, which means no self harm on wrist or about trouser line and NO PICKING! the self harm I can do, but the picking... I have no idea how I am going to cope, so basically, I need suggestions, and fast, anybody? please?