You are so very new to what is happening in your life. It is understandable to be upset and fearful of what is to come. You are human and yes, you are going to have days when you get emotional. When you do, allow those feelings to wash over you and then release them. It's not easy to detach from his actions/comments, but in time, you will be able to do so.
One thing you need to come to grips w/is that the old marriage is dead, gone. If, and when, you and your h reconcile, it will have to be a brand new relationship. You cannot go back to the old ways because neither of you will be the same once his crisis is over. You both will have grown by leaps and bounds and at that point, you will be the one to decide whether to try again, not him.
For now, breathe, it's okay to cry and grieve for the loss of the relationship/marriage. It's never easy, but you will need to pick yourself up and think about selecting a lawyer to help you make some decisions. Once you receive separation/divorce papers, you need to look at your situation as a business deal gone sour. Think w/your head and not your heart when dealing w/the separation/divorce. Do not allow him to sway you w/promises of what he will or will not do for you because they change their minds entirely too quickly if things do not go their way.
Breathe! Be kind/gentle to yourself today.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.