He actually can't divorce you except in your country of origen and you can contest that. However, there are almost no laws that would stop him from leaving you and never paying a penny. The divorce laws of Latvia will not extend to wherever he may be going. You could say that you will not contest the divorce provided he gives you a certain amount of money on which to survive AND an NOC so that you can stay in Doha. Alternatively you could approach his employer and plead your case with them. They do have the power to stop him from leaving the country. If his boss is a decent person he would do just that until you were taken care of. Was he hired under a family visa? Then at least you have an airfare home from his employer.