Kia ora!
The sad thing is that there are specialists who are like that; dismissive and patronising towards women having problems of this nature. The good thing is that he gave you the referal for an ultrasound and urine test. If it were me I would go ahead and get them done anyway. Don't wait until it happens again, although if you're anything like me you'll be feeling it again tomorrow anyway. Get the scan and the test done and keep the ball rolling. Be persistent. YOU know your body; you know things aren't right AND you have a previous diagnosis which should set a precedent for action on these symptoms.
As to diet, here's a link to an article about oestrogen dominance, a situation that many women find themselves in which exacerbates the conditions and symptoms that you're experiencing http://www.naturalhealthmag.com.au/content/oestrogen-detox. It is easily managed through diet.
Personally, I've found that balance is as much about adding plenty of good things to my diet as it is about limiting unhelpful things; and to be honest, the things to limit are things that aren't really any good for anyone - refined flour, refined sugar, saturated fat and alcohol. So I guess the kind of diet I have now is low carb, because I try to steer clear of things like white bread and pasta, pastry and alcohol. I don't worry so much about carbohydrates that come from veges and pulses because they come with all the other goodness of veges, which is what we need most of - especially leafy greens, raw if possible.
I'm intollerant of homogenised dairy products (the fat molecules have been made too small for my gut to digest properly, which causes nausea, bloating and lethargy - something that's often mistaken for lactose intolerance), so I stick to whole milk and yoghurt made from whole milk with no symptoms at all. Not nearly as damaging for weight gain as you'd think; in fact the opposite has been the case. I've been 58kg consistently since making this change.
I avoid refined sugar almost completely as its really damaging for liver function and try to add good quality protiens (almonds, fish, chickpeas etc) and fats (coconut, cashews etc) where I can because they're good for liver function and gut health.
I guess I try to stick to whole foods as much as possible.
From everything I've read and experienced, the best thing we can do is bolster our bodies' natural ability to deal with these problems, which means supporting the liver and immune system, as well as being kind to our digestive system so that we can get the best from what we eat and reduce inflamation - the article above gives a really good basic overview.
I hope this helps!
Lauren x