Jan,
If the swelling and pain is at the region of the thyroid, then you need to get an ultrasound of the thyroid as well as a CT scan of the neck. It is possible that you have a cold thyroid cyst - cold meaning that it is not affecting the function of the thyroid gland and the secretion of thyroid hormones.
Menopause does not cause swelling or pain of the thyroid. Occasionally if you lose a lot of weight, the adam's apple can look more prominent, but this is not true of the thyroid gland.
You do need to get your thyroid gland checked out.
I hope this helps.
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Experienced in the management of Pregnancy,Infertility,Menopause and all problems in Pregnancy and Gynecology