do you know what triggers the bulimia? You could try counselling, ring round a few places and see what type of counselling they offer. Your gp can refer you to a counsellor which would probably be free but if you really don't want to go via your gp ring round a few places and ask if any charge. Could try hypnosis? May be pricey though. Counselling good if you can find the right person to talk it over with.
Hey scots lass, just wanna say well done for admitting you have a problem and trying to find help. Its not easy to do, so you should be proud of yourself.
Good Luck with whatever treatment you decide on :) xx