Thanks for your query, I have gone through your query. The jaw crepitus and pain, ear popping and head ache can be because of the disc displacement without reduction. Consult a oral physician and get it diagnosed. You have to get a radiograph like OPG and TMJ views done. You can take anti inflammatory drugs like piroxicam 20mg twice daily on first day and twice daily on next 6 days. You can also take muscle relaxants like chlorzoxazone. You can give hot fomentation over the joints. Do not eat hard things, do not open your mouth too wide. take soft diet. If it is not reduced even after all these things, then you can go for soft slints. I hope my answer will help you, take care.