tuition fees!! Please is an urgent

So I'm international student who is studying in London, and I have had personal problems I couldn't pay my tuition fees and I must pay it at the end of this semester but I know I can't. So I was wondering if I can go to any European country get a career and come back to the UK and start a business, or will I be in the blacklist and I can't come back at all.

I would maybe contact your university to see if they can help you financially in any way. I doubt you'll be blacklisted - that's only possible if you refuse to pay and run! Usually universities will set up financial plans to help students who are struggling and I'm sure they have other options for you to take but talk to them and see what they can do. It's better to ask for help than suffer in silence. Sometimes, the options may not suit you and you could be taken off the programme so do be prepared for that.
There are a few ways to make money - get a part-time job, take a loan from the bank (not ideal because of high interest rates), borrow from friends/family, sell some stuff or reduce your expenses and save. Bursaries, scholarships and hardship funds may also be offered by universities - discuss this with them.
I hope that helps.