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This could be symptoms of irritability and low mood, could be attributed to your disease or underlying mood disorder
. You could be having anxiety neurosis
due to hyperthyroid state as well. Better to consult a Psychiatrist
if you need separate medication for sleep and mood disturbance. Hypothyroid can cause the following but is not ideal to consider since you have other symptoms like weight gain, what about sensitivity to cold, dry skin
. Try to remain calm. Do Yoga, Pranayam for stress relief. Better position to help will be a Psychiatrist to help you deal with these symptoms and also rule out mood disorder as well. Get your Thyroid levels estimated first. Then you can go to next step.