My DD was the same around that age, which coincided with the winter months. It was so hard. We got referred to ENT who after a few appointments suggested putting from gromits in, but the infections eased off before this happened.
We found that she got an ear infection as soon as she got a runny nose, so I tried giving her vitamin drops to boost her immune system but I've no idea if that helped.
I also took her to see a chiropractor as I was utterly desperate, and they gave her what looked to be a head massage (very gentle- she loved it) and said that her jaw wasn't extending enough to flex the tubes between the nose and the ears. She explained that in babies the tube is horizontal so can get clogged easily when they have a runny nose. We went to see her 3 times I think.
She had her last ear infection early June which coincided with the end to all the colds going around and the chiropractor sessions so it's hard to say if they worked or not, but to be honest I would try the same again as it was so horrendous to see her in such pain.
In terms of helping with the pain now, the doctor advised me to give both calpol and ibuprofen at once, alternating doses. I didn't find calpol really helped her much, ibuprofen seemed much better. I also moved her earlobe gently in circles to try and help the draining process. I spent every night walking in circles singing to her as it was the only thing that calmed her a bit.
Hugs to you, it's so hard. Hooefully ENT will give some good advice. They did reassure me that many children grow out of it quickly, and that many find that gromits are very helpful too. I hope it eases soon