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I've got something similar, the main annoying thing for me is that my ear pounds/throbs in time with my pulse, particularly at night which can make it hard to go back to sleep after a night feed for DS2. I'm regularly having a light hayfever type sneeze but really only at night as well
I've seen 2 GPs about it, swapped after the first one and settled on the second (I didn't really gel with the first one). The first one put me on a medicated nasal spray which has only done minimal to reduce the blocked/watery feeling in my ear. The second GP has thrown some antibiotics at it a couple of times which seems to clear it mostly but it's back within a week or so of stopping them. I can feel something's in my ear but it can't get out. The GPs think my eustachian tube isn't working properly to drain my inner ear.

I've tried the FESS sinus wash stuff as well as the nasal spray and it hasn't done much to help either and my sinuses don't feel really heavy or tight.

I've been having issues with my ears on and off since last April (cold & cough after one another repeatedly as well), finally got to the GP in Sept for me to try to deal with it. I'm starting to think I might need a referral to an ENT to see what to do next. I'm about to make another appointment for sometime in the next week (GP is on leave for a week I think) to see what we're doing next about my ears.

DS2 had similar experience with his ear infections between July & Aug - and ended up with grommets (infection stopped with antibiotics but started within a couple of days of stopping) after ruptured ear drums.