My late mum often had pain from her ears when flying and after a particularly bad experience a medical examination revealled that she had a perforated ear drum.
If you are concerned why not pop along to your local doctors surgery before you go to make sure that you don't have any obvious problems or hardened ear wax that can easily be removed. Like the others, I'd also recommend sucking on sweets during take off and descent when ears are proned to pop. Years ago, during RAF flights, we used to be offered a drink to encourage swallowing during take off as an alternative solution too.