Hi Julie08

First of all I am so glad you have had the treatment you need to deal with your condition, but I am also sorry to hear that you had to seek and pay for private care because the GP was unable to understand what was wrong.
It is usually the case that continuous progesterone must be prescribed for those with endometriosis (even though you have had a hysterectomy), as you say (from your private consultant) in case there are endometrial deposits outside the womb which would grow in the presence of oestrogen and cause pain and discomfort that you were experiencing.
Here is what it say on this website:
"
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. "
https://www.menopausematters.co.uk/atoz.php#GlossELong may this continue - your feeling better and that you no longer feel the discomfort.
As Taz says - usually once you've had a hysterectomy you no longer need progesterone, and most women feel better because of this but in your case this is different due to endometriosis.
For others reading this in the same position, who might feel that private treatment is the only option but cannot afford it - do refer your GP to the brief information that is quoted above from this website, and if necessary insist or ask for a referral to an NHS specialist, mentioning potential endometrial deposits, and as per the consultant, all women in a similar position should be given progesterone immediately following the hysterectomy.
Hurdity x