Hi alone,
I know where you're coming from. I once took a dating hiatus for some years because I wanted to work on myself and I wanted to learn to BE by myself.
It's not very easy to go from always having a boyfriend to being forced to be alone with your own thoughts, but that's the point. No one deflecting from you dealing with your own problems.
I had a lot of moments of intense panic; I felt like a druggie in need of a fix. When I would get in these moods I'd call or text everyone and their father, looking for shreds of male attention. It was pretty intense. Finally I told myself "Well, you're sort of defeating the purpose here."
I cannot stress how important mindfulness is, like mere says. Observing without judgement, not running away with your feelings but saying "Hey, you there. Shame. How's it going?" or "Intense anger, long time. How've you been?" It's a matter of not getting caught up with your feelings but simply noting that they exist.
I would make myself 2 things - A list of positive affirmations(things like "I am strong. I can stick this moment out without acting impulsively), throw them all over your house, pull out a notebook of them when I'm struggling, etc. I also made a self-soothing list. A list of things I can do to make myself feel better when I am feeling very emotional and impulsive. They can be very simple, like eating a favorite piece of chocolate, or maybe painting, or playing a game of solitaire, whatever you enjoy. And do as many as you need to. It's not meant to fix but meant to help you get over the humps. Feelings always pass. You don't feel the way you did 6 months from now as you do today, nor will you feel the same in 6 months.
Are you seeing a pdoc as well and are you on any medications?