This patient support community is for discussions relating to thyroid issues, goiter, Graves disease, Hashimoto's Thyroiditis, Human Growth Hormone (HGH), hyperthyroid, hypothyroid, metabolism, pituitary gland, cancers, thyroiditis, and thyroid Stimulating Hormone (TSH).
Have you had any thyroid tests done at all? Hypo can make a person pretty darn whacked. I know I felt like death warmed up earlier this year. If you are hypo you would more than likely have put on weight without even eating any thing more than usual, but you say you are pretty lean You need to get TSH, Free T3 and Free T4. I'd be telling your doctor to do some cortisol tests too. You need to do that at home in the morning. Simple test no pain involved!
If it is Addison's you need help immediately as left untreated it can be fatal.
Go to your doctor as soon as you can and get the tests done, and let us know how you got on.