A 13-year-old girl complains of pain in the area of her heart, palpitations, feeling hot, dizziness, weakness. These complaints appeared 12 months ago, the girl lost 4 kg of weight, her performance at school became worse, and she developed sleep problems. Objectively, she is tearful and irritable, presents with finger tremor, increased moisture of her skin, and reduced tissue turgor Heart rate - 104/min. Palpation detects dense and painless thyroid gland that is enlarged to a third-degree goiter. What is the most likely diagnosis in this case?