Starsnight, I truly hope that you don't have Addison's! But, honestly, as I was reading your symptoms, before I got to your suspicion, Addison's is what came to mind.

My Mom was diagnosed with Addison's over 15 years ago. She had the extreme salt cravings, she would pour salt into her hand and eat it. She was never able to get tanned, then she suddenly had the darkest tan I'd ever seen, during the winter. She was also extremely nauseated, she lost a lot of weight because of it. She had extreme muscle pain. She was always cold, and it took 6 months to get a diagnosis. So by the time they figured it out she was almost too far gone. She could do nothing but sleep all day every day.

I really do hope this isn't the case for you, but I hope you get tested very soon.

Please let me know what the outcome of the test is, good luck!