Summarize this article:

The most distressing symptom of endometriosis is pain and cramping that can occur in the abdomen and pelvic area. Fortunately, you may find that your endometriosis pain can be relieved by non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen, naproxen sodium, and aspirin. These drugs are good for any type of period cramps or pain during urination and bowel movements.  If your pain increases during your menstrual period, consider starting to take NSAIDs about 24 hours before your period is due.  Talk to your doctor about the best regimen of NSAIDs for you. In general, though, you can take 400 to 600 milligrams of ibuprofen orally every 4 to 6 hours. Do not take more than 3200 mg in a 24 hour period.  For naproxen sodium, you can usually take 275 milligrams every 6 to 8 hours, not to exceed 1375 milligrams in any single day.  Alternatively, you can try 325-650 milligrams of aspirin orally 3 or 4 times a day, but don't go over 4 grams. Always talk to your doctor before taking any medication. The omega-3 content in fish oil can help to reduce inflammation and lessen the severity of cramps and pain. Try taking 250 mg to 500 mg of fish oil supplements per day to see if they help you long-term.You can find fish oil supplements at most home goods stores.

Summary:
Take over-the-counter NSAIDs to relieve pain and cramping. Take fish oil supplements to increase your omega-3 intake.