Hi JennaWenna,
You need to...
#1 Wear a SmartGuard night guard at night only (not more than 12 hours per day).
OR
#2 Wear a full coverage TMJ splint 24 hours per day.
If your jaw is locked more than a few weeks, the joint tissues may/will adhere or bond in place requiring only surgery to unlock your joint. You need to act fast on this. Search for the SmartGuard Combo kit to make sure you have the right smartguard for you.
The above is the best lowest cost to treat your conditions. You need to totally relax your muscles. Discluding your back teeth to keep them from touching anything is what you want to do.
Also, running or aerobic exercising is beneficial to helping your muscles relax in a healthy way to help.
Let me know if you have any other questions.