Help Surviving and moving to UK

I have never asked for money before, but I REALLY need help this time. I don't know where else to go or who to turn to. I need help raising at least 500-700 dollars to be able to pay for my expensise. I am a newly graduated medical student, living in Mexico and I can't find a job here. I live in a 1 bedroom house and barely have money for food. I am selling everything I have to be able to move to UK and keep studying. I teach english classes privately to try to support myself barely making enough for bills. I would be very thankful if anyone could help me. My goal is to be able to move to UK to keep going with my studies.