The thyroid and eliminative function are intimately connected. The old doctors knew that all manner of ills could be ascribed to intestinal "toxemia" ... including goiter and lumpy breasts. The fact that your constipation has gotten worse illustrates Dr. David Brownstein's observance that hyper or hypothyroid symptoms may become temporarily worse with Iodine supplementation.
So, if you have always had trouble with your digestive system, that REALLY needs to be addressed. In my opinion, Konstantin Monastyrsky knows the digestive system . Have a look at his site: