Hi Pichounette,
Re your comment:-
"I did explain my worries to the gynecologist but to cut it short I have no choice other than hormonal treatment (well except an hysterectomy)".
Think you need to find another gynae; one whose knowledge is more up to date!. Actually a hyst if it was done for endo may not be the end of your problems re it as it can recur particularly if its in the intestines. The pill won't treat endo; it will only mask its symptoms. In my experience as well endo gets worse the longer it is left.
Have a look at www.endo.org.uk which is the Endometriosis UK website. It has lots of info of there and has a good message board.