My jaw has been locked for about a week

Im looking for ways i could loosen my jaw up. I can move my jaw but I cant open it fully. My jaw is only locked on the left side. Also I don't experience any pain from it. My questions:

Is a warm or cold compress better, and have they made any sort of difference for any of you?

My jaw only locks when I am asleep so I know something about my sleeping position is locking my jaw. If I sleep on my left side, my back, or my chest my left side locks up so I have to sleep on my right side. Is there anything I could do while sleeping to loosen it up?

When my jaw is unlocked, my jaw clicks whenever I open it. When my jaw is locked there is no clicking. But today my jaw is still locked but also started clicking. Is this good?

What is the best type of doctor to see?

Are there any massages or tricks that you guys use to loosen up you jaws that work for you?

Any sort of help os appreciated. Thanks!