I am a qualified IT engineer and my potential to make money is much higher!!!!
That's how it works under Polish law. The court can base their judgement not on what you earn but on what you COULD earn. I know, it's ludicrous. They also don't have to take into account income versus living expenses. Having said that as you live with your mother, they would consider that you have an income of over 3,000zł per month and don't pay rent so you can easily afford to pay 1,500 per month in child support.
i owe about 30000 in back dated support. but what can i do? Will a european arrest warrant be issued? even though i have nothing to give her?
You have two issues here, the money you already owe on foot of the previous judgement and the future payments. As you have the upcoming DNA test, I wouldn't worry about being arrested. Even in Poland where the law can be very weird and unfair compared to Ireland, they'll probably give you leeway until that's dealt with. But if paternity is established you will continue to owe that money plus interest. You're still not likely to be extradited as you're Irish, but at some point it will be put in the hands of a Bailiff for collection and in theory he could apply to the Irish courts to have the judgement enforced. But I would say cross that bridge if or when you come to it. As far as I know if it goes to the Bailiff, your ex who is the plaintiff in the case, states what she wants done : A) a lean on your salary B) property seized, or C) jail. She's not likely to want to see you in jail as that means there's no way she'll get any money.
As to the amount of future payments, they will probably expect you to pay around 1,000zł per month, so about 250 euros. But the most important thing is to get the DNA test. How much does it cost? You really need to get the money together for that somehow if you want to get your life back on track. To be honest, you should have had it done years ago when this all started.
You can overcome the drink problem. Others have done it. You can do it too. You have a good profession and can re-train, update your skills etc. There are loads of free back to education courses/opportunities in Ireland. You can get back in to the workforce and take control of your life again. You can't just give up and say ' I'll keep breathing for the next thirty or forty years, but my life is over, I'll just sit and stare at the four walls'. You're entitled to some happiness but you have to make it for yourself.