Personally, I'd start looking at alternative medicine options, though unfortunately we don't have the same expertise among practitioners in Australia. If you haven't done so, I'd really recommend you watch the video I posted of Dr Alessio Fasano talking about the causes of autoimmune disease. There are a number of protocols for healing intestinal permeability and rebalancing the gut microbiome that might help you - like the GAPS diet, the Specific Carbohydrate Diet, the Wahls Protocol and others. Since you have so many conditions, you might find the GAPS Protocol is the place to start as it has a well-established reputation for healing many conditions. The author is Dr Natasha Campbell-McBride.
I'm reposting the Dr Fasano talk for ease of reference:
(Even though I'm recommending alternative medicine, both of these doctors are MD's and Fasano is a world-renowned coeliac researcher and clinician.)