Hi Beth,
You are most definitely not alone! Unfortunately, the weight gain on the hydrocortisone seems to be common, although not universal. It is my 8 yr. old son that has adrenal insufficiency, but he is still very thin. Exercise and protein seem to help many people with the weight issue. I'm sure there are people more knowledgeable than I am that can speak to that though.
I really wanted to comment on the MedicAlert - my son has a necklace pendant and I can tell you from our experience that the paramedics most certainly looked at it, as did all personnel that came into contact with my son in the ER. (We now have a letter from the endo. too, but at the time we didn't.) The ER physician *immediately* called the endo. on call at the Children's Hospital to be sure he was treating Andrew correctly. If you haven't gotten the Medicalert yet, do it! It really could save your life. Jill