you should give yourself a massive pat on the back for going to the doctor's in the first place - it really is a big achievement in itself. which is why it's all the more awful that you got that response. the weight management programme may work to the extent that you might lose weight by responding to regular weigh-ins, but it will do very little to help your ED i suspect. and i expect you know exactly how to eat to lose weight, and the disordered eating overrides that... though as you say it may be an alternative route to getting more specialised eating disorder help, i don't know. though often in the case of EDs diet programmes are not advised, so it might be better to steer well clear
i'm only just in the early stages of therapy (cognitive analytic therapy, different to cognitive behavioural therapy) with the eating disorders service, so i don't know yet how well it will help. it seems good so far. i don't enjoy it (it makes me think and feel things that normally i would cover up with starving/bingeing behaviours), that's for sure, but i do feel pleased that i am actually trying to Do Something About It. i had two triage sessions over the phone, followed by another in person at a mental health centre in the next town. it took about six months from the initial visit to the doctor's for the formal therapy sessions to start. just to be clear, i was stable in my eating before i went to the doctor's. it obviously shouldn't be a barrier for you if you're not, it's just how it happened for me, and tbh i was surprised that they took me seriously given that i was a healthy weight and wasn't in the depths of disordered behaviour at the time iyswim (i thought they would just say 'well you're obviously fine now, now run along')
right now being stable is like walking on a knife edge - i don't trust myself not to fall off one side or the other into starving or binge/purging. i have only been stable for a year though, in comparison to over 10 years of disordered eating, so it still feels very fragile. however, my personal relationships have improved (i'm not trying to lie my way out of meals or engineer time alone to binge), and i'm happier overall. and it was my desperation not to lose this that made me go to the doctor's to sort out the mental health part
i control my weight (and eating behaviours) through low carbing as it controls my blood sugar levels well so stops the physical reactions at least. of course it's not a cure, and the element of control/restriction can be problematic in itself, though i do actually eat regularly and "normal"-sized portions which is a big change. this is what works for me personally and i wouldn't want to suggest it for anyone else with similar problems
i can't write a food diary because i'm so obsessed with being perfect that i physically can't write about any deviations - though it might still help you, i don't know? what you could do instead is just put a mark in your diary when you binge, another for when you purge, so you can demonstrate that at least, even if you can't list the actual intake
it might be worth looking at books which you can get from the library (it can be 'prescribed' by a doctor, but is available to all) the full list is here - 'overcoming binge eating' refers to bulimia a bit, as well as the one specifically for bulimia. it talks about the common reasons for disordered eating, and provides some insights and self-help strategies
another book worth trying if you haven't already is susie orbach's 'fat is a feminist issue' - some bits of it are a little dated but it has some fantastic insights and suggests some strategies
sorry for the enormous post!