Sorry to hear this young lady/man - are you a hockey player? [I had two teeth broken playing this super sport!] You might need root canal treatment and/or a crown, depending on the severity & extent of damage. If you are a student [oc you are!!] UNDER 19, you can get free NHS dental treatment - there is a cheaper NHS version of a crown and endodontic treatment [endo] can be FOC under some conditions.
In the meantime, get cocodamol 8/500 [8mg codeine + 500mg paracetamol][take no more than 8 tablets in any 24-hr period [I assume you are over 12]] from pharmacy [cocodamol 30/500 can only be prescribed by a doctor] PLUS crush a couple of cloves and rub into the tooth - jointly, these measures will help relieve pain.
Speak to your dentist t-rrow to find out [I am a medic not a dental surgeon, so pls do not take all above as Bible!
Good luck!
M.