TMJD Temporomandibular Joint Disorder and singing.

I am a professional touring singer in the U.K. I have been a long time sufferer of TMJD for the last 5 or 6 years now. I have had numerous treatments over the years: Moulded splint, my jaw joint rinsed out with an operation, botox injections. Upto last week the pain was manageable with only moderate pain levels and my cocodamol and citalopram taking care of this, but recently the pain has switched to a sharp shooting sensation in my left jaw which radiates around my ear and and a nauseous sensation. I thought I had grown out of these massive pains because for the past 18 months the pain would go over night (also while singing) and now its suddenly come back and I have constant pain now. It's quite clear that singing aggravates it as well as loud music (the bass vibrations) as well as when I put headphones on my head even at a very quiet volume.

I have a 8 day period in which i'm free from singing and would like to know how to get the best from it. To try to restore the TMJ just back to mild/moderate pain levels.
Thanks Ben