Increasing space on MSQL

[absolutenewbie]

I have built my website and stupidly havent backed it up. I just tried to start Apache and my sql only to find msql keeps shutting down. This is apparently because there is only 12MB of space and mysql is full. Is there a way to increase mysql without logging in to Phpadmin (I cant seem to log in either!). This is my first website, any help would be much appreciated. Thank you