OP, I can really relate to your post. My son (22) has bulimia nervosa, and his behaviours are almost identical to your wife's behaviours: bingeing, vomiting (multiple times a day) , over-exercising and so on. I should imagine, your wife will have other related behaviours too.
My son sees a therapist once a fortnight for an hour. I think it is helpful insomuch as he has someone else to talk to, but I live with his behaviours 24 hours a day. There are days when he has eaten everything in the house, and the vomiting has caused weakness in the left side of his heart, and resulted in hyperthyroidism (mild at the moment). Again, because he is not dangerously underweight, there is no emergency intervention.
BEAT have been helpful for me. They offered my son the opportunity of accessing a support group for young men with bulimia, but he is very asocial, and this was a bit too much for him. However, I had six sessions of counselling from BEAT, which I found helpful in that I had a reference point for guiding my son.
One of the problems was that the main book upon which the counselling was based, 'Skills-based Caring for a Loved One with an Eating Disorder: The New Maudsley Method' was pitched primarily, although not exclusively at parents of young people with EDs, and this was not entirely appropriate in our situation, where our household comprises me and my adult son.
However, my son's openness about his disorder, how frequently he vomits and so on, is really helpful for me because we can talk about possible triggers or contexts for an episode, and I have my phone ready in case he has a heart attack (because I also fear for his life).
I could go on for pages about this situation, but needless to say, it is so difficult to live with someone with a profound ED. I will add that I had the same ED as a teen and young woman and it nearly killed me, so I do not underestimate the seriousness of the condition.
My advice, which is only based on my experience as someone who had such a disorder, and as the carer for someone with the disorder is this:
-Remain non-judgmental and supportive. Low self esteem may be a very deep part of this condition, and bulimia reduces your self esteem to nothing.
- Encourage your wife to visit the GP for regular check ups. The dentist can also offer helpful advice about how to protect the teeth (they are a lot more understanding now than when I had the disorder).
- This condition isolates the victim and the carer. Try to build time to do other activities (not food or exercise related if possible).
- As others have said, the children need to be protected from the worst of this disorder. There may come a time when they will need to know about EDs so they do not feel that excessive exercise or an intense focus on weight is 'normal'. They may be too young for this discussion at the moment.
- Look for ways of distracting your wife, if you feel she is going to binge/vomit.
- Tell your wife that you cannot answer questions about her weight body shape. These questions become incessant, and arise from the fact that the person with the ED cannot see themselves as others see them.
- Your wife's emotions may manifest themselves as feelings of being 'fat' or 'heavy'. She may misinterpret everyday sayings such as 'You look well today' as meaning 'You have put on weight'. It can seem like you are walking on eggshells, but remember, this is a mental illness, and you are not responsible for your wife's behaviour.
- Consider a carer's assessment. I went for one. I did not expect any help for myself, but i wanted agencies to know that my son needed help and that I was performing a caring role.
I will stop there because I have written too much already.