Did you ask for a solicitor after you were arrested?
Were you interviewed, prior to being charged?
Basically, if the police didn't follow any of the PACE requirements they have no chance of making the charge stick. But if you were actually more drunk than you realise and agreed not to have legal representation, refused to see the doctor etc. Then there's a chance you may not win.
Was the case adjourned because you don't have a solicitor? It is essential you get one, you should probably be eligible for legal aid. Most solicitors worth their salt should get you off on this, but it really does depend on how drunk you were at the time and what you remember. It may be that what you remember happening and what actually happened are quite different.
Good luck!