Swollen gland, right side, no earache, no sore throat, gland feels hard, hurts to touch, headache?

Must be evaluated. You should see your PCP or acute urgent care for an evaluation. You may have an infected lymph node. Monitor temperature and breathing. A throat swab may be indicated.

In addition to a possible enlarged lymph node, this could be a swollen submandibular gland, which is one of your salivary glands. You should get this evaluated as it could be infected. Sometimes, less commonly, there could be a stone present which could cause swelling and pain, too.