I chipped my back tooth up top and it's very painful i'm also guessing same tooth has a cavity my whole left side of fa hurts how can i alleviate pain?

Temporarily..: ... you can take NSAID OTC pain meds that will decrease inflammation and pain. After reading this, you should call a local dentist and make an appointment, as an emergency, ASAP. The pain will only get worse over time to the point that no amount of medication will work.

Need dental Rx: OTC pain killers may blunt the severity of the pain until you can get to a Dentist for Rx, but this is not a DIY situation. The pain is a red flag telling you that something is severely wrong. Please get professional help ASAP.

See a dentist ASAP: When trauma damages the nerve inside the tooth, the symptom is often acute pain. Untreated nerve damage can lead to severe pain and even tooth loss. A dentist can fix the problem in one appointment before it becomes serious. Avoid unnecessary complications and see your dentist ASAP. You can use NSAIDs OTC to control toothache. Take care.