Hi, So sorry this is happening.
Have you been diagnosed with Endometriosis? I'm guessing so if you are on this site. Although transvaginal scans can show some types of Endo, ordinary ultrasounds won't, and to get a detailed diagnosis you need a laparoscopy, and preferably one done by an 'Endometriosis Specialist Gynaecologist' - general gynaes are not as highly/specifically trained about Endo in all it's forms and hiding places, and often miss things - ditto when removing it.
So ... : Bee, Tboag and Jade have it right, you are best to try and get referred to a BSGE unit - there may even be one quite near you. Have a look at the 'Endo UK' site - link to their website at the top of this page - and maybe talk to one of their trained advisors. Also, read around on this site, and check the posts on here by 'Lindle' .
ER may be able to give you pain relief, but that's not enough.
Hope it gets sorted soon.