My jaw is crackling for a year but recently sometimes it won't open fully like it's jammed and causes some pain in my ear what can i do?

Tmj: Sounds like tmj. With the locking of the jaw it should be evaluated. Several specialties work on the joint but i would seek help from someone that advertised for it like a neuromuscular dentistry office. Meantime use nsaids, soft diet, heat, no gum, avoid clenching and grinding. If you do grind try a bite guard at night.

TMJ: Many times, TMJ symptom begins with malocclusion in the teeth causing compromised muscular adaptation of jaw muscle for function. If untreat, the muscle controlling the TMJ disc movement may be tear or injure, causing the disc to get stuck during jaw movement (open or close lock). Splint, follow up for comfortable open/close jaw, then treat the malocclusion.