Wow!
honey, you really really need a friend or someone with you right now! Can you go to your ex's? she seems to understand you better than anyone else by the sounds of it!
Your 'separation' type of anxiety is a classic symptom of a form of depression! some people lock themselves away whilst other have to be with people continuously. There are different prescriptions that will help ease that enxiety, and calm your feeling of fear and panic.
You have made the biggest step now by admitting that you know there is something wrong!!! So huge well done for that! in less than 12 hours, youll be on your way to feeling better after being diagnosed by the doctor and on the road to making yourself better.
Good luck honey.