Bit on back of neck about weak ago,painful,red ring around,draining some,very stiff neck,had headaches&tired. what should i do? had do i tell what bit

Maybe infected now: Some bug bites get infected, becoming an abscess in the skin. One's primary care doctor can evaluate to see what is going on. There may be more than one thing happening, such as a second problem causing the headaches plus a coincidental bug bite. If there is a skin abscess, it may need to be opened so the infection can drain out (antibiotics may be needed if there is infection).