Every light sniffle or cough I have picked up over the last couple of years has developed into a brutal sinus infection. I do not like this new chapter in my life.
I had one that lasted for literal years and still have issues. Antihistamines for a short period while using the Flo bottle or something similar can help
I used to lie on my back with my chin tilted up until I felt a tiny bit of drainage/a crackle. Lie on my side with my head at a slightly weird angle to try and get the same. Press between my eyebrows while pushing my tongue against the roof of my mouth for 20-30 seconds, then let go. Tap gently between my eyebrows and the spaces beside my nose where the sinus cavities are (or the sides of the bridge of my nose).
Eustachian tube massage can help a little too. This one is designed for ear infections but the ear nose and throat are connected, and getting one moving can help the others drain.
I can't handle spice but that might help if you can. Perhaps a little cayenne pepper in some hot soup.
And I had a lot of hot tea and paracetamol for the aches. If you can eat honey some of that in the tea might soothe your throat from the post-nasal drip and maybe be a bit antibacterial
Np. Also if nothing else is working you can try Nasonex spray or the GP can prescribe Dymista. Just be warned using antihistamines or sprays too long can cause rebound congestion