Hi Jahou

So sorry to hear about all your health issues and to cap it all having an early menopause.
Was the endometriosis confined to your uterus? Another question - what progestogen are you being given to protect your uterus from thickening? Maybe you have a Mirena coil. If not you must have some form of progestogen as well.
Yes you are right about 50 mcg being the minimum estrogen patch dose to help protect against osteoporosis. If your endometriosis is confined to the uterus I think a Mirena coil is all that is needed (I'm not an expert!), but if you have deposits elsewhere in the body a systemic progestogen is also required ( ie transdermal - patches) or tablets - containing a progestogen as well as oestrogen.
This is what it says on this site:
Endometriosis
There is a small risk of reactivation of endometriosis with HRT use and any recurrence of symptoms should be reported. If a hysterectomy has been performed for endometriosis, the choice of HRT use thereafter should be influenced by the extent of endometriosis at the time of the operation. Since hysterectomy often causes a premature menopause, it is often advised to take HRT until the average age of the menopause; 51 years. HRT after hysterectomy usually consists of estrogen only. However, in the presence of endometriosis, estrogen may cause stimulation of residual deposits and consideration should be given to using continuous combined (estrogen plus daily progestogen) therapy, or tibolone, though little research has been done on the effect of different types and duration of therapy. Medical treatment of endometriosis often involves ovarian suppression which, along with ovarian removal, may increase the risk of osteoporosis.I can understand the reluctance to prescribe a higher dose until you get to a menopause clinic - but I would have thought the GP should be able to give you a 50 mcg dose. In any case - even 25 mcg should not be given without additional progestogen and especially in your circumstances.
You will find a higher dose should help with mood too.
Hang in there and try not to get any more upset

Hurdity x