About 4 to 5 times a day it feels as if my throat is closing up and i start panicking it lasts for about a minute, what could be causing this?

Thyroid problems: Thyroid problems, like you mention in your profile, are a common cause (or factor) of panic attacks and similar situations (tachycardia); in which you (usually) hyperventilate as a result of your fear. However, this deserves to be mentioned to your dr for further diagnosis.

Panic attack: A classic symptom of panic attacks is to wake up from sleep with a panic attack. Often the attacks appear to have no trigger, but the underlying dysregulation of the stress response system is easily triggered into a panic attack. If the person also avoids things/activities for fear of having a panic attack, then panic disorder becomes the diagnosis. Seek cognitive behavioral therapy for panic.

Have thyroid checked: You are having attacks. These can be caused by your thyroid going too high. You are on thyroid replacement. Have your thyroid checked. Panic is a horrible experience. Personally i would recommend treatment with a psychiatrist to get out of the immediate pain and to allow you to get your school year off to a good start. When you are less symptomatic and can focus better, then get into cognitive tx.

Anxiety: Anxiousness or worry over something you might not even be aware of. Try to find a therapist to talk to. It will help your lot!