It is hard to relate what you are experiencing to sexual problems))
It is most likely some kind of upper respiratory tract infection, tonsillitis - mouth ulcers
(however it depends on the colour of the ulcers
and may be oral candidosis), accompanied by rhinitis - sneezing and mucous, and the chill, fever headaches come from increased body temperature.
The rhinitis can be of allergic or infectious origin.
Visit a doctor he will prescribe you something for the treatment.