IM LOSING IT.....I AM GOING CRAZY....NEED HELP!!!

OH my God, I am not right......I'm losing it.....I am getting to the point that I am going to need to go to a hospital. I can't block him, I am having panic attacks.....I keep calling him over and over and he won't answer. I am sitting in my car at work and I can't pull myself together. I can't believe he destoryed me and now he can just walk away.....
I am not well......what do I do......I am seriously losing it....I am the one that is driving him crazy cuz I am so confused.....I don't understand why he did this.....
please I know I should not be calling him, but he won't respond.....he destoyed my life.....I have never acted like this before.....
i somehow have to pull it together to go back into work by 1:30. He filed divorce on me after I kept going back over and over again believing him every time he said he would change. I have never experienced anything like this......I am the one that has gone completley crazy now....
I can't lose my job......I know what you are all telling me, I just can't stop.....I almost feel like I do need to go into a hospital, but I can't lose my job.....
I need more help than what I can do for myself right now....I am not strong enough to stop....Please help me.....