It's pretty fucked up that your family won't financially help you with medication...but I'm not surprised at this point. It's toxic family situations season after all...!
I don't know how good or bad is the situation with public healthcare in Ireland, but can't you get your medication through a social worker, charity organisation or something ?
If you're a young girl, you could try to give out your curriculum to baby-sitting agencies, I guess. If you're a guy, you can apply for more manual jobs... construction,ect. And, depending on how much your symptoms affect your possibilities to function properly in not so friendly environments - I think considering enrolling in the army as suggested above , or joining the law enforcement ( which is already more manageable, and less restrictive than the army *edit : those are jobs that provide you with good housing options in my country , ) might be an option to consider - I personally regret not doing this, impulsive, uncalculated decisions and the resulting poverty only made my mental health worse. But again, doing things that are not necessarily in line with your values out of despair isn't for everyone. Make sure you are at peace with yourself if you're making radical decisions...
But I'ts quite a pity you're not considering college as an option.... wouldn't you have housing options on campus as a student or something along those lines... ? Or you just don't have the necessary energy/ self-confidence to give it a try :/ ?