How can i heal tmj and fast or how long more is it going to last i have slight pain in jaws clicking jaws and abit of instability any advice or how long more will the injury last for?

If TMJ is bad enough it may force you go fast. I do not think fasting and TMJ relief have.been studied. Or perhaps you miss typed? Recommend reading before sending. I find it very useful. ;-)

TMJ dysfunction takes years to become established. Symptom reduction, likewise, is a laborious process. Occlusal Orthotic (Night Guard) may provide relief in weeks to months. If so, your occlusion my be contributory and an Orthodontist should be consulted. Analgesics, biofeedback, muscle relaxants, may ease symptoms. See Dento facial Pain Specialist or specialist Oral Pathologist.

At you age, I suspect wisdom teeth may cause muscular disturbance which lead to TMJ symptoms. I would remove the wisdom teeth as a first step. The next step is treating malocclusion. Ortho/crowns may be required.