Hi thanks for your question.
From the symptoms your have described,it looks like that you have developed pharyngitis(inflammation of pharynix) following common cold
Pharyngitis is common complication of common cold.
The semen which you have swallowed some time ago cannot remain stuck to pharynx or mouth for such a long time.
The semen which you have swallowed had caused pyaryngits at that time, which got resolved of itself and those semen got destroyed by your gastric juice.
What your having this time is sever pharyngitis and may be tonsilitis
The sticky materail, like sperm which you say comming out from your mouth, could most probably be ruptured peritonsilar abscess
Consult a nearby physician who will examine your throat to look for source of puss and treat you accordingly.
Hope this answers your question.