Ear Pain
Perfect advice from Jerry B. The trick is to start trying to equalise the minute the descent starts, don't wait until the pain has started. Constantly repeat procedure until you have landed.
Some people find it useful to use something like Olbas Oil. Get a plastic glass, put a tissue in it, ask the crew to pop a tiny amount of boiling water on the tissue and put a few drops of Olbas Oil and inhale the vapours. This can help if you have a cold.