Who is the consultant? Is it just a general gynaecologist in a local hospital? You have at least stage 3 endometriosis out of 4 stages. Any medical treatment, including 'artificial menopause' GnRH agonists are only effective in stage 1 minimal disease. GnRH agonists work on your brain and can cause severe side effects, including permanent ones, and have no long term benefit. So you must not take this.
You must get on the waiting list of an accredited endometriosis specialist who is qualified to treat your stage of endometriosis and don't put this off. You will no doubt have to wait a while anyway. The NHS guidelines (NICE) confirm that you must only be seen by a specialist in a Centre of Excellence. You can choose anyone you like under the NHS in or out of your area. Take a copy of the list and take it your GP and tell him/her you want referring to a specialist centre as recommended by NICE. They cannot refuse. The list is at:
Endo is a disease of the immune, endocrine and reproductive systems. It is an allergic condition so the best thing a woman can do is eat no processed food as this is loaded with chemicals - just food made from fresh ingredients and lots of fruit/veg and drink lots of water. Also weight should be kept down as oestrogen is produced in fat tissue and overweight sufferers can often have most severe symptoms.