Joint pains are a common complaint in hypothyroid patients, and yes, sometimes nasal allergy symptoms seem to be related as well. (Hives can also be related to thyroid disease, btw.)
Google Mary Shomon - she has an excellent site on About.com for thyroid sufferers. She's a little controversial, because she's not a physician but just a lay patient advocate, but she has put up some pretty good info.
A good book is The Thyroid Solution by Ridha Arem M.D.
