With anemia comes loss of appetite which could be an explanation for the weight loss, it is a symptom. I never learned much about hyperthyroidism sorry I will be of no help there
I to got/get panic attacks that were sudden and came with the anemia as well. It can be a nasty thing if not treated the side effects are horrible. I'm not really sure what you are asking here. Weight loss and anxiety are both symptoms of anemia though but they are both symptoms of many other things as well.
I hope that your Dr's figure out what is going on and are able to get things under control for you!