If its what I have its call allergy rhinitis, I developed this along with other symptoms when I was starting on the change. It caused problems with my eustachion tubes......they became blocked and made me go dizzy and a detached feeling.......horrible. doc use to give me sudafed to shift it, it became an on going problem so decided to see an entire who told me I had enlarged turbinates which blocks the eustachin tube so the fluid couldn't drain which was why I was dizzy and detached. Went to a allergy clinic and I'm allergic to dust and some kind of pollen but not the common ones like hay etc. Apparently its impossible to test you for every flower, tree etc, I use to use a nasel spray called nasafan I think it was recommended by ent, allergy clinic offered me something else but I use antihistamine every other day to keep it at bay. I blow my nose every morning and every other week hold my nose and blow to pop my ears. It also gives me allergy congunctivitis my eyes can sometimes drive me mad which is why I opt for the antihistime which helps with both nose and eyes the nasel spray only sorts my nose out.
Tell you what you could try first.......sterimar isotonic nasal hygiene, boots have it, no drug in it its like sea water to clean your nose.
Apparently its common to develops allergies when on the change.
There's also some thing called post nasal drip which sounds like what your dad had!
Do a bit of googling with the above, let me know if I can help with anything.
Clio
