Do you have a Primary Doc? This many hospitalizations I am concerned as to why you are so easily being dismissed. This is not acceptable.The hospital I went to for the SI injuries (that got sutures/staples) is a little ER in my podunk little town. They basically just patch you up and send you off. When I went in for the "stones," it was believable, because I've had stones before and I was tender to the touch of the doctor (cuz I had beaten myself with the tennis ball/sock combo). The same with the headaches. I convinced the doctors that I was in a lot of pain. And for a while, I was. After I got the spinal tap, I got the usual Post Lumbar Puncture headache. I convinced my mom because I've never been one to like to get injections or have blood drawn. And I even cried when the doctor said he was going to have to do an LP.
You really must come clean with your T and Psych. They are not there to coddle you. They can help you deal with this. Please, please, please be honest and open with them. That is what they are there for... to help you figure things out I *do* have a GP. I saw him on Tuesday. He couldn't find any reason for my headaches. I didn't tell him I had done it to myself. He knows I SI. He's taken stitches out twice, and staples out once. All within three or four weeks. :-S I really like my GP. He's an awesome grandfatherly fellow who really listens and explains things in layperson's terms.
I have come clean with my T and Pdoc about my re-start of SI. I had started as a teenager and managed to stop in my mid-twenties. Then, out of the blue, I started up again.

And it seems like this relapse is even worse than the original time.
If we got hurt and ran up to her crying she would say "are you bleeding?"
"N-no" we would sob
"then stop crying" she would reply and icily turn away.
(so, eventually I injured and then felt I could cry becasue I was then bleeding) My dad was kinda like that. Some of his favorite things to say were, "You wanna cry? I'll give you something to cry about!" and "I brought you into this world, and I can take you out of it!" So I kinda stopped crying. Nothing ever came of it but ridicule and dismissal. I also have a temper, as does my dad. We would get into fist fights all the time. Police never did anything about it. When I was in high school, he almost broke my finger. I told a teacher, and CPS came to the school to interview me. I told them it was a one-time thing. I was afraid they would take me away from my mom and my home.
Creating injuries/wounds etc is in a way of asking for help, but the surface wound is treated, not the deeper inner wound. I've never really used SI as a way of getting attention. I hide it and make up (believeable) excuses as to why I have a bandage. I've told the doctors/nurses at the hospital(s) that the wounds are SI, but only because I don't see them anywhere but when I'm in there.
Plus I have learned that if I get urges to do an attention injury, that I don't keep mum about it, I speak up and nark on myself to my support people. Speaking the urge aloud take the craving out of it. I won't narc on myself, because I don't want to go back IP. And if I *did* narc on myself, I'd probably be put back IP. I just *can't* go back. I'm finally
VERY close to getting a job (in public safety). If I were to be put back IP (again) it would greatly jeopardize my chances of getting the job I want.
I talk to my T about the SI. It still scares me to do so. Thats one reason why I sought out this board. Some place I could confess, without being ratted out to the people who could "put me away." It is kind of cathartic to fess up about stuff. And anonymity is nice, too.