Not sure if i have anything of value to offer you, but i do have some questions and comments.
Q U E S T I O N S
(1) What's your age?
(2) Were the fractures from running? (E.g., stress fractures?)
(3) Can you connect the tendonittis to sudden jumps in mileage or type of training?
(4) What are the "bunch of other" injuries? Are they running-related?
(5) When you feel pain or the possibility of an injury coming on, do you push through or cut back or rest? So many running injuries are worse than they need to be, resulting from a failure to heed very clear warning signals. We're an impatient lot, we humans.
C O M M E N T S
(1) If you're still growing, then your body is having to adapt to both the physical growth AND the training. Be patient. I was injured much more as a young runner (H.S. and early college when i was still growing) than as an adult runner).
(2) Walking barefoot is good; keep that up as you're able. When you have to wear shoes, go with something like you're already wearing (H-Street)
(3) Hundreds of laps parking lots is probably bad for the knees.
(4) Spend your energy running on top of the snow, not shoveling for hours to remove it. I don't live in New England, but sometimes we get fairly deep snow on the ground. I just slow down the pace considerably and prance a little more.
(5) I can't vouch for what the good, reputable doctors tell you. I'll assume they're not dummies. Nevertheless, they've been trained to deal with the symptoms in a particular way. They promote their system and usually discount those of others. (On the other hand, we miminalists tend to the same thing.) If you've tried what they offer and it hasn't worked, maybe you could "come over tot he dark side" and try for a while a more natural approach. Think of it as an experiment.
_______________
I think some minimalists who live in more norther climes should weigh in more on the snow / ice issue since it's not something i've had to deal with for months out of the year. Mukluks?