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Symptoms of endometriosis:

The symptoms of endometriosis can vary.
Some women are badly affected, while others might not have any noticeable symptoms.

Learn more On Mayo Clinic page.

Painful periods (dysmenorrhea). Pelvic pain and cramping may begin before and extend several days into a menstrual period. You may also have lower back and abdominal pain.
Pain with intercourse. Pain during or after sex is common with endometriosis.

Pain with bowel movements or urination. You're most likely to experience these symptoms during a menstrual period.
Excessive bleeding. You may experience occasional heavy menstrual periods or bleeding between periods (intermenstrual bleeding).

Infertility. Sometimes, endometriosis is first diagnosed in those seeking treatment for infertility.
Other signs and symptoms. You may experience fatigue, diarrhea, constipation, bloating or nausea, especially during menstrual periods.

Treatments:

There's currently no cure for endometriosis,
there are treatments that can help ease the symptoms. Learn more on Mayo Clinc page.

Painkillers such as ibuprofen and paracetamol.
Hormone medicines and contraceptives.
Surgery to cut away patches of endometriosis tissue.
Surgery to remove part or all of the organs affected by endometriosis.

Useful tips:

Here are some tips that might help to improve the symptoms. More tips On Health line page.

If the painkillers does not work, go to your doctor and ask for stronger painkillers...
Get a hot water bottle with fuffly cover and have good rest.
Drink hot tea and others drinks to heat up your body.
Warm baths and a heating pad can help reducing cramping and pain.