Endometriosis

I..
Hi,
Has anyone been diagonosed with endometriosis?
I have really bad pain on left side under hip bone, I booked an appointment at a gynocologist and while waiting for appointment the pain eased and wasn't so bad.  
I went to the gynocologist anyway to be told it's endo 🙁
I'm already on the pill so they told me to double pack so I skip my period.
At this time the pain still hadent been bad recently, but I did it anyway
I did my 2 months on pill then had my 7 day break, I'm day 6 back on my pill and the pain is back!! It is so bad!
The gynocologist did offer me the key hole surgery to check extent of endo, but I said no at the time as the pain had eased!
Do I go back and have it done? Has anyone got any advice? Does your diet help the pain?
Any stories or experiance with endo would be great!
Thanks