Hi Dave, I'm also new to this forum, welcome.
I suffer from Tinitus and I've had it for years. I think i've had it that long that I don't seem to notice it so much now.There are a There are some simple things you can try yourself that may help with your tinnitus. These include:
keeping your stress levels down, (I know easy to say & do).
take regular exercise
make time to relax and try special techniques such as meditation
keep a low level of background noise, such as a fan, radio or TV
join a local support groupfew self help techniques that may help you with your tinitus.
There are no medicines which have been shown to effectively treat tinnitus itself, Dave. However, your GP may be able to prescribe you medicines to treat an underlying cause, if there is one.
It has been found that Depression or anxiety can make tinnitus more of a problem and treatment of these conditions may help bring some relief. People with some long-term, painful conditions sometimes get relief by taking low doses of antidepressants such as amitriptyline. This may also help sometimes if you have tinnitus.
As for the jaw clenching Dave, when you clench your jaw is is called bruxism, and headaches may be a side-effect of some popular anti-depressants, such as Prozac, Zoloft, Paxil and other drugs called selective serotonin reuptake inhibitors (SSRIs). There is a drug called Buspar which is used to relieve anxiety and research says Buspar appears to target a specific area of the brain that might be influenced by SSRIs to cause the jaw clenching. They say that Buspar may act like a little bit of dopamine, meaning it may cause the jaw muscles to (become less) tense."
Hope this helps :)