Hi Vee2Bee,
I am so sorry to hear that you are having these problems. Now i know that I am a guy, but if they have not found anything physically wrong specifically with any of the ladies organs, etc, the chances are that you are suffering from the same condition as the vast majority of sufferers with Chronic Pelvic Pain and matters not if you are male or female in this respect - the issues and symptoms are often similar or even the same and so are the potential solutions.
Please do NOT despair, there is a lot you can do to help yourself. The 1st thing you need to do is invest in the book 'A headache in the Pelvis'.
It is written by David Wise and Rodney Anderson - one of them was a eurologist himself suffering with this condition for 20 years before finally he stumbled onto a new train of understanding regards this condition that has lead to new treatments.
I have only just started reading the book, but it looks brill and this guy no longer has the pains, by following a number of steps. exercises etc. Whats more, it has helped many others that have suffered with the same condition for years.
Sadly, most eurologists have not read it and so they are mostly stuck in their rigid beliefs that this is either psychological (yes, it is aggravated by stress and try not getting stressed out with this....not easy. I am a psychotherapist, and i have found using some relaxation techniques on myself has really helped), which is not the case. Or it is related to some dysfunctional component. Many have surgery etc and more often than not to no avail. From what i can make out the issue is usually that when the body 'perceives' that there has been a problem in that region for any length of time - e.g. an infection / injury etc....the pelvic floor muscles contract and don't relax like they should, creating this dull ache, which it sounds like you experience and what you have said re sitting on the loo and warm baths etc....all tie in.
The good news, there are many exercises that can help to reverse these muscle contractions and gradually alleviate these symptoms. It is a viscious cycle, which can be reversed by many accounts.
There are also many on here who have mentioned various pain relief which is effective at alleviating the symptoms, eg amitriptyline - although not sure for ladies what works best...probably the same.
It is apparently one of the most misunderstood conditions, so don't let your Eurologist or gynae practioner convince you there is no hope. There is lots that can be done to improve, alleviate and in some cases virtually overcome this problem. Be patient though, it may take a little bit of time, but sure you will get there :-)
Kindest regards
Rob