Constantly starving lately and get pounding heart if i ignore it. raised pancreas and liver enzymes. goitre but normal tsh. blood sugar been tested and never remarked on. not gaining weight. theories?

Probably due to: Anxiety. I expect you are overweight and Insulin resistant. Insulin is stimulated to lower your post meal glucose back to normal. Thyroid is enlarged, but functioning ok. Probably on the road to prediabetes and worse as time goes on. You need to eat less and exercise more to lower weight. Talk w/your doctor. It isn't hypoglycemia, which doesn't happen because your body prevents it.