I have a personal loan and credit balance in UAE. Until now, I have paid my installments without delay. Mean time I've got an good offer from Qatar and hope to join them. I know one solution is produce a guarantor. Some say this might give me difficulties.They say- Without informing bank, I can leave and but keep paying without any delay. But I have a doubt when I make exit here, whether bank can stop me at airport. Please advise me.

I don't know UAE law, so you should check with someone familiar with their banking laws. But I don't know of any laws where you would not be allowed to emigrate while there is still a balance on a loan.