First do you have a way to calm down? Either a med or some sort of activity that helps? Dealing with the rush of anxiety seems to be an important part of getting through this. You can't think straight if your mind and body are so anxiety ridden that there is a flood of feelings and chemicals affecting everything.

If nothing comes to mind, I can suggest a short breathing exercise that calms the vagal nerve. It's easy to do and tends to work temporarily.

Second have you run into this attachment issue before? Do you have a sense of what it stems from? Does any insight into it help you understand it better? It seems to me that needing someone is normal at stages. None of this is permanent. You might have times when you feel no need. Fighting against yourself seems to be making it worse. Can you just accept that you might need the relationship for now? Just a way along the path.