Can I take diazepam, naproxen, ibuprofen and paracetamol at the same time?

Hello KaitBran
No! It is not advisable to take 3 pain relieving medications at one time. Both ibuprofen and Naprosyn are NSAIDs. (Non steroidal anti-inflammatory drugs) Their purpose is treat fever, pain and reduce mild to moderate inflammation. On the other hand paracetamol is just another name for acetaminophen or Tylenol.
Taking two NSAIDS, at once would not get rid of your pain & inflammation any sooner. Also, by taking both NSAIDS at once you would increase your chance of getting a gastrointestinal bleed.
Diazepam is know as a benzodiazepine drug. Diazepam can treat anxiety, seizures or be used as a antispasmodic medication.
Your best bet is to contact your general practitioner explain to he or she what is ailing you and let the doctor prescribed the correct medications.
Feel better.
bestpup