Eustachian tube and headaches

I have a new struggle with headaches/migraines, caused by a fever and middle ear infection I had a month ago.  If I don't use a nasal decongestant, such as Sudafed, the headache comes on and can become a migraine.  It is a 24x7 problem, so I use a nasal decongestant all day.  I was told that the cause could also be from allergies, but up until this point I've not had allergies.  When researching this, no mention is made of headaches. Does anyone else have this problem?

I've learned that the eustachian tube connects the middle ear space to the back of the nose. Its primary function is to ventilate the middle ear, ensuring a normal pressure inside the ear and the secondary function is to drain any accumulated secretions, infection, or debris from the middle ear space.