I have no idea what is the genesis of this fear. But you said "embarassingly making me afraid of the dark." Why are you embarrassed? For being afraid? That is human, that is natural, that is normal and the mere fact you were BRAVE enough to actually admit that? Damn, you have my respect

One possible thing to consider is gradual exposure. That is, be in a room by yourself (or with two or less people), i.e. satisfy the conditions which are likely to cause your panic. Have someone outside the door, so that they can come in and make you feel safe again.

Let the anxiety build up in you, for a VERY short period of time. 1 second, 5 seconds.

Then repeat, but build it up, very very slowly. 1 second. Then 2 seconds.

You are not weak. You are not stupid. You are brave and courageous for admitting that you need support.