What should I do about my TMJ pain?

I haven't been able to chew gum for years because it is so painful. For the last six months I have been having jaw pain especially when eating. A few weeks ago the cartilage in my ear it was so painful I couldn't touch it and bad headaches. I went to the doctor a few days ago he said it's probably from grinding or clenching my teeth. I have been taking advil before going to bed but, it hasn't been helping. One night it was so bad I was up for hours and I had to use a hot water bottle. in the few days after it's been hurting to eat anything or talk. I'm not sure what to do if you have any advice it'd be appreciated thanks.