Hi welcome to HCM.... Here you have right side neck soreness and tenderness present ... So it could be pharyngitis like posterior pharyngeal wall infection or it could be tonsil itis..... Your posterior pharynx examination should be done .... If needed suitable antibiotic can given if needed .... Salt water gargle done ... Excess spicy food avoided .... More water .... Short term steroid useful for relieving inflammatory swelling .... Lymph nodes also palpated and CRP done .... Consult Ent surgeon nearby for physical examination.... Take care