I have a few ideas:
1) Do you have an employee assistance program? I live in BC and have a nurse friend who has access to Interlock. It's free counseling for certain employee groups, and they give you 6-8 sessions or so directed towards a goal (in this case, it would probably be tackling the disordered eating). If you live in Victoria, I can PM you the name of an excellent counselor to request.
2) The eating disorders program in my city accepts self-referrals. An intake counselor will call you and make the decision about whether you qualify or not. Sometimes GPs don't understand eating disorders very well (e.g. mine thought that binge eating without purging wasn't serious enough to warrant a referral). So, I would recommend tracking down the eating disorders program near you and giving them a call yourself, just in case you do actually qualify for services. It's a provincially funded program, so you can find it in the blue pages for your area under Province of BC.
3) It sounds to me like you suffer from PMDD (pre menstrual dysphoric disorder). I'm surprised your GP wouldn't recognise that. At any rate, the recommended treatment for this is an SSRI (or, if you prefer a more natural alternative, you may wish to try 5-htp or St. John's Wort). Sometimes you don't even have to take an SSRI for the full month, just the part of your cycle that feels the worst. Interestingly, some SSRIs are approved for the treatment of bulimia. Just because you don't purge anymore doesn't mean that the chemical imbalance that contributes to the disorder isn't still there.
4) If you can't access counseling through work or the eating disorders program, then I second the Overeaters Anonymous thing. It works for a lot of people. They have a website where you can find meetings in your area if you google OA.
Good luck, mama. It sounds like you have a lot of strength, and you've been through a lot lately, so be gentle with yourself.