A transplant is a massive physical and psychological trauma, and you cannot count on the hospital to recognize this. A great many people experience depression after transplant, and it should be expected. The anxiety too, for the same reasons.
Now, I don't know how to handle the osteopenia and osteoarthritis. I think those need to be addressed with a specilaist separately. You should try to find yourself a good psychologist, and open up to her/him about everything you feel. Vent your feelings about the transplant. You need validation right now.
I've had two transplants in my life, one at 12 years old, and another at 17 years old. Now, at 30, I'm waiting on another. My feelings weren't given any credibility after either of them, and a few years ago I cam within minutes of committing suicide. That is how serious the trauma is. No, you are by no means the only person who feels the way you do.
The medical system fails both children and adults. You should reach out to other people - friends, family, and a therapist, and express to them how you have experienced what's happened. Find something you are passionate about to devote your identity to, or you run the risk of believing you're only alive to feel pain. That's what nearly destroyed me.