Girls - taking the odd painkiller will not work ! You need to take the full amount allowed - both ibuprofen and paracetamol. You can take paracetamol and then in between those doses you can take ibuprofen. You might as well get the cheap tablets from the supermarket as the expensive branded pills are just the same. I know some people don't like taking tablets but this for just a couple of days per month and well worth it if it improves your life. I know I got a thumbs down for saying this before but you have to find a way to cope because this is going to happen to you every month for the next 30 to 40 years and life does not stop because you have a period. If taking the full doses does not help then please go to your GP for more help. Pain is not something you have to put up with and there are other options via your GP.
The other thing I would say is plan ahead to use these couple of days to pamper yourself - eat chocolate, drink coke, have a pizza, relax with a hot water bottle (those wheat and lavender bags that you heat in the microwave are good and less hassle than filling a bottle with boiling water), read a book in bed, watch a film with a friend. Use it as a valid excuse to catch up on sleep or do things you normally don't have time to do.