Well you have rhinitis anyway.

I would see both an ENT and a very good internist and ask them both to help you
figure it out.....

Have you tried oral decongestants like Sudafed, for those times when
your nose is really stuffy?

Have to ask. Do you have any allergies? I was suffering from these
symptoms for a couple of years and couldn't figure out what was wrong
with me. I exercised regularly and ate healthy but still these symptoms
persisted.

Then this year, I had my first major sinus infection and now I have
post nasal drip, aches, etc. I now realise that the previous years of
unwell were due to low level infections but my body was able to keep
fighting them off. The immune system was just working overtime. I was
getting digestive problems, sleeping trouble and persistent unwell
feelings but never a full-blown infection with yellow discharge, etc.

I now know I have dust-mite/dust/cat/etc allergies which were the cause
of these problems. So, if you haven't already, check for allergies and
take measures to reduce your exposure.

I can't give you a diagnosis, but that is the way I started out;  also
had low grade fevers, no PND, pain, etc. at that time except for stuffy
feeling behind nose;  would take an antibiotic and fever would go away
for a while;   then started with moderate fatigue in afternoons to full
blown severe fatigue and malaise that eventually wouldn't get better
with antibiotics to debilitating pain and inability to function at all.
I had to quit my job.   It turns out ALL of the openings into my
sinuses have been too small to drain properly;  probably just enough to
not show much on CT scans.  It took a really astute ENT to find this.
See the rest of  my story under "continuing sinusitis saga"   It is
probably very rare for all of the openings to be to small,  but, if I
were you, I would definitely get this checked out, especially seeing if
the main ostia into the sinuses are big enough.  Sometimes just opening
them up will solve the problem without removing tissue, bone, etc., a
very minimal procedure.  I'm not suggesting you have this done, just
check it out.

Kathyw