If it's a US university, you should have no problem getting financial aid.
If it's a UK university, you could possibly get Federal Direct Loans or private loans, though unless you absolutely must i would suggest staying away from private. The interest rates are up above 10-15%, it really adds up fast.
Your first step would be to fill out a FAFSA using the school code you've got, then if it's a UK school you need to call the Department of Education and obtain your full 8-page Student Aid Report (SAR) because international schools can't receive them electronically and you can't get it online. If it's a US school, they receive it electronically so you don't need to do anything.
Once you have that, contact the financial aid office at the university and find out what to do next.
Since you have nearly three years of residency, your least expensive option would be to pay home fees at a UK university and use US federal student loans to cover it. If it's an undergraduate course, I believe you can also get UK loans and grants on top of that.