The main thing is not to worry. Everything will be fine. This is not the worst thing that can happen in life. You should go to a doctor when something is bothering you. In other cases, I would recommend going to the doctor every six months and taking the necessary tests. I won't advise you anything about medications. All this should be prescribed individually by a doctor based on the patient's condition. Not only drugs play a role, but also their dosage. A friend of mine was prescribed this medicine
https://www.charityrx.com/drug/levothyroxine-sodium. But again, it's all individual. Maybe you have a completely different diagnosis and you will be prescribed something else. Get well!