Empty sella is an often symptom-less unrelated finding unless you've had a previous pituitary gland removal. Increased intracranial pressure or intracranial hypertension has completely different findings. Sounds like you need to go back on something that contains t3 and t4. Obesity complicates all aspects of health, and can cause tachycardia, arrhythmias, difficulty sleeping (OSA) which can lead to headaches, fatigue, depression etc. Sounds like you need to talk to a multidisciplinary team to determine if your symptoms are caused by something else.