The lowest blow!!!

Upon returning from  a stay with who I thought to be my STBX and my daughter I checked the mail only to find papers stating that I am divorced by default. He went behind my back filed for divorce claiming that he did not know my whereabouts. I was never served any papers informing me of this, therefor there was no response on my part. I had no clue about this. He knew how to contact me.... we have 4 grown children also friends who he could have asked for my address, phone number, I tried to contact him by phone etc. He was awarded the house and all belongings plus the business and also custody of our youngest daughter soon to turn 18. He even had the nerve to ask for child support. Marriage...32 yrs.... homemaker the whole time, (a damn good one). He refused to leave the home so to save what little dignity and sanity that was left I had to move out.  Seems to me that he has stripped me of everything illegally. What can I do? Any advice would be greatly appreciated.