Hypothyroidism in cats usually goes hand-in-hand with kidney failure.Once a cat has hyperthyroidism it almost always ends up leading to kidney failure. If you cat is not in kidney failure right now I would definitely have her heart checked for cardiomypathy(hope I spelled it right) as it sounds like the coughing and vomiting could definitely, along with the hypothyroidism, be a symptom of a heart problem. Heart problems almost always show up with the hypothyroidism and/or kidney failure. I also highly highly recommend you no longer feed any dry food whatsoever to a cat with hypothyroidism to prolong or hopefully stop the onset of kidney failure.Yes, dry food is a definite contributor to kidney failure and also other problems.
I hope this helps and good luck with your cat.

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