Went to dentist and had local anaesthetic applied. how long before i can eat and feel right?

Depends on amount: As far as when you can eat it depends on the type of restoration placed. As far as feeling right, it depends on how much was given, location of of injection and your metabolism rate. Usually i tell my patients the felling should last 2-3 hours. If you are more active, this can shorten this time, the type of anesthetic also matters.

4-6 hours: Local anesthesia usually lasts 4-6 hours.