I think you will see that those pains will subside, or at least I hope they will. This is one of those issues that cannot be explained to someone who hasn't had the experience.
As for the fatigue, your primary care physician can order up thyroid T3, T4 TSH blood tests easily along with perhaps other enzyme tests to possibly help get a grip on the cause of fatigue. radiation can damage the thyroid, which is located in the front base of the neck. It is not uncommon to want to sleep 9-10 hours per night during recovery but simple tests can put your mind at ease.