Provided i use two pain relievers, paracetamol & ibuprofen for example, do i need to watch their daily dosages seperately or should i reduce usage?

Yes: Do not exceed 6 grams a day of paracetamol or 2.4 grams a day of ibuprofen. You can use the two together, if necessary, at their maximal doses.

Separate: Paracetamol or Acetaminophen is of particular importance to track because of its effect on the liver. The official limit in the U.S. Is 4000mg per day. But the unofficial limit has now been reduced to 3000mg. The limit of Ibuprofen per day is 2400mg. It has more of an effect on the gastrointestinal system, so be on the lookout for anything from stomach upset to bleeding in the stool.