If the source of these problems is the thyroid gland, then working on strengthening your throat chakra will help. The throat rules the thyroid. All disease is a lowering of frequency in the body, so it makes sense that if you raise the frequency of your throat chakra, all organs ruled by it will also benefit. A Mercury Square for improving the health of your thyroid gland will also be very powerful. A Venus Square as well for the same purpose, whichever one you can do soonest. The throat and heart chakras are very closely related.