Hi - sorry to read your post - it may well be due to endo in what is called the Pouch of Douglas (this is also referred to as rectal/vaginal space) as this can severely interfere and cause pain. Bowel problems also. I had this and the pain would come on ad hoc and at first I thought it was constipation pain, albeit I didn't think I was - it progressed to feeling like I had been kicked by a horse in my groin area causing me to have to be doubled up. Sex had been painful too over the years unless careful re position so it all made sense. It may not be PoD endo in your case but, as you have been diagnosed with endo in the past, might be worth having a discussion with an endo specialist consultant. Another possibility is adhesions from prior surgery but seems unlikely as it is a more recent development.
Taking contraceptive pill is a great help with pain for many and is a way of dealing with it for a time but to be honest - eventually the only way to deal with endo is to have it removed by excision surgery.
GPs see endo as a 'women's condition' and will refer you to the local hospital gynae regardless of what they happen to specialise in within that spectrum. They usually have a wide string to their bow; endo often being a tag on to obstetrics / fertility / menstrual problems etc. Where a consultant has gone on to specialise in endometriosis, they tend to be known as Endometriosis specialists rather than a General Gynaecologist. Obviously those now classed as Endo specialist also have the designation of OBS GYN under their belt but have progressed on to have undergone more specialised training.
Unfortunately I learnt this the hard way, as have many ladies.
It may feel scary but worth getting your pain checked out by an endo specialist consultant as it will help you to know the cause rather than speculate and put your mind at ease and provide you with options to help get your pain sorted.
I wish you all the best
Love Fran x