Yeah, people do avoid cruciferous veggies because they are goitrogenic, but it doesn't make much sense to do so. There are many, many goitrogens, so just avoiding the cruciferous family isn't going to change much.
What goitrogens do is impede the uptake of iodine by the thyroid gland. This can make it harder for the gland to make hormones. But you'd have to eat an awful lot of them to make you hypo, or cause a goitre (hence the name). Besides, if you are on a full replacement dose of thyroid hormone, then they shouldn't affect you at all. Nor if your gland is missing for some reason. They Don't affect the hormone you take by mouth. And they Don't damage the gland, as some people think.
However, that doesn't stop you being allergic to them, or being affected in some way if you still rely on your gland for some of your hormone. But, then again, not all goitrogens affect all hypos. It's just a case of if it disagrees with you, stop eating it.
Did you eat anything different, new today? Or are the things listed things you eat all the time? Tomatoes do disagree with some people because they are part of the nightshade family. Or, the iodine in the seaweed in the sushi could have had an effect - although it can only have been a tiny, weeny amount. Or, was there any soy in anything you ate? Because soy is a goitrogen plus! It also impedes the uptake of T3 by the cells, so that could have a very bad effect.