Firstly, I am sorry you are going through this. Endo is not an easy thing to deal with.
I was put on Duphaston which is pure progesterone and when that didn't work they moved me onto GnRh analogues which is what you have been prescribed.
I was on Buserelin (Suprecur) which is just another brand and was also given HRT treatment to prevent bone density loss.
I will not lie it was hard. I was 27, newly married and technically menopausal. You need a good support system. The mood swings weren't as bad as I thought they would be but the hot flushes were difficult.
For me I was on it for 6 months and it eased my symptoms a bit so I could stop taking prescription medication and I was reviewed at that point. My endo was considered "aggressive" and came back once I stopped taking the drugs.
As I was still experiencing pain I was booked in for a laser lap and dye a week later (private medical cover) and following the surgery and a follow up meeting I was told that I would need IVF because of all the scar tissue inside and the endo deposits. I was told to start to try for a baby immediately to start the ball rolling. I was 28.
It was a very bad week learning that I wouldn't conceive naturally, but not that bad because a week later I was pregnant 
That was 14 years ago and I am relatively pain free. Pregnancy pretty much reset the clock on the endo. An extreme choice but we wanted children anyway. I have two sons, I have painful periods and ovulation but apart from that I am pain free.
I massively overhauled my life when I was diagnosed, from diet to meditation and it has helped.