Inner ears are so isolated that decongestants don't have a lot of effect - and phenylephrine doesn't do a thing for me (or my DH) under the best of conditions. Is it still legal to buy pseudoephedrine in Australia? In the USA we have to sign for it, but we can buy it.
If it's been going on for more than a week, and/or if it seemed to get better and then worse, it's likely a bacterial infection that would benefit from antibiotics.
Another thing that helps me is a heating pad behind the ear plus postural drainage (lying with the plugged ear up). Of course that does run the risk of the infected mucus draining right into the other ear. 
Good luck. I had a refractory ear infection a few years back and it took seven months for the hearing to come back in that ear. It was just horrible for a good month. That "tunnel" feeling (aka head encased in cotton) is the worst part of it I think.
Speed comes from what you put behind you. - Judi Ketteler