Hi, I'd like to help you with your question.
It sounds like you are under enormous stress right now. You mentioned that you are selling your home, going back to school, making custody arrangements for your children (a lot of emotional stress there) and you have a history of abuse. It is not surprising that you are feeling physical pain in reaction to your feelings.
Some of the actions you are taking are very good. Seeing a psychologist will help you express your feelings, give you support and help you find ways to cope. Support groups are also excellent ways to get support and get your emotions out. Both of these things are going to help you re direct your emotions better and probably will have a great effect on your physical reactions.
Another thing you can try is exercise and changing your diet. You may already have done this, but I thought I'd mention it in case. It is very common advice to say that exercise and diet help, but they really do. Exercise alone can increase your endorphin levels so you have a greater sense of well being and it also can help you feel more in control of your body and subsequently, your feelings. Your stress level goes down and you sleep better. Not to mention the knowledge that you are healthier and more able to handle everyday challenges. Diet also goes hand in hand with this.
Relaxation techniques can help as well. Learning to relax can help you focus better and give you a more centered feeling, particularly when faced with a lot of stress. You can do this through learning relaxation techniques, listening to calm music or even learning how to have fun. Here is a guide to help you get started:
Thankful lists and grateful lists can help you learn to look forward and appreciate your life now. Whenever you feels overwhelmed, it is good to notice the things in your life that are going well. It re focuses your mind and helps you relax and you get to see the positive. To start, keep it simple. Be thankful for being able to see, for your job, health, etc. As you practice, you can list more advanced things.
Don't ignore your problems. By ignoring them, you don't solve them but you do spend energy trying to suppressed how you really feel. By talking about your feelings and allowing yourself to express your thoughts and emotions, you can heal.
Make goals and challenge yourself. We all need something to work towards and something to look forward to. Start small. Make a goal for the following week to do something you have not done before. If you usually stay in on Fridays, go out and meet a friend.
Be sure to check with your doctor so you know that your pains are not physical. Getting an "all clear" from your doctor will help you focus totally on your emotional health.
I hope this helps. Let me know if I can help any further,