Have swollen lymph nodes behind ear, under jaw, skin near my adam's apple is tender to touch and sometimes itchy and i feel constant stiffness there?

Swollen glands: If the swollen glands are in setting of a head and neck infection such as ear, sinus or throat, then they will resolve as the bacterial or viral (mono)infection is treated. Otherwise you may need a biopsy to exclude neoplastic growth. Given the tenderness you likely have an infection and need to be seen by your doctor to make a diagnosis and possibly start you on appropriate treatment.

More info needed: Have you had any recent viral illness. Often viral illness can be associated with swollen glands. Any swollen glands under your arms or in your groin area? Thyroid issues need to be checked for as well, if you have the area you described as tender. Please be seen by your physician to get a good checkup and history and probably some blood tests too for Mono, cytomegalovirus, or immune issues.