Poor you

Also happened to me once...when I was on holiday. But doctors in beach resorts are proficient in ear-syringing
However I agree that if you can avoid syringing, avoid it. It can damage your hearing irreversibly. It is supposed to be very rare, but when it happens you don't really care whether you are a rare or common case....
I have a collegue who adviced me a recipe that his frineds, proffesional divers use:
Ethanol+ Boric acid, but I don't know the concentrations. You can ask however in the pharmacy, they will probably have experience with mixing ear
drops...
Here in germany one of the commercial products contains in 10mL:
0.5g docusate sodium (= dioctyl sodium sulfosuccinate)
Ethanol 1.5g of 96%
1g of 85% glycerol
Again they shlould be able to mix this for for you in your pharmacy.
There are also versions with soda.
Olive oil is supposed to help only in mild cases. When your ear wax is very hard, it will probably not help.
Good luck.