I Have Had Achy Stiffness In My Neck And Shoulders

I have had achy stiffness in my neck and shoulders for two weeks. Also had a sore throat for about five days. Now have some sniffles but not Cold like sniffles. This is week two without relief. thought it may be a cold or flu but seems to be lagging too long. Extremely tired as well. No fever or vomiting/stomach issues. I am very healthy normally. No one else at home is sick. Recently traveled to Laughlin Nevada for New Years eve. So this is day 11 being sick.