The Ready State Virtual Mobility Coach is like having a virtual Kelly Starrett in your pocket.
Yacine, sorry you’re having this issue. A good first destination is Kelly’s old video on upper body mobility work:
Improving shoulder extension:
Sorting out neck soft tissue: http://www.mobilitywod.com/2013/03/tmjd-jaw-mechanics-and-head-aches-part/
I hope some of these videos help restore motion and relieve restriction. Let us know how you get on.