Want2beThin there's a lot of autoimmune disease going on with you. Diabetes, fibromyalgia, ME, and I'm sure I read recently that recent research with bi polar is pointing towards it being exacerbated by sugar consumption.
Do you think your issue may be what you are eating, rather than how much?
I've just finished doing a Whole30, and lost over 7 kilos in a month, but Whole30 is about much more than weight loss. It is basically an elimination diet which seeks to remove problematic foods from your diet for 30 days so that your body can start to heal and reduce the inflammation which drives a lot of these diseases. The idea is that after the While30 you do a structured reintroduction, but I'm continuing on to make it a Whole60.
I'm still overweight, but less so, and whilst I'm still considering WLS, I'm prepared to stick at this for a bit longer.
My joint pain has reduced, my asthma has completely gone, and my mood is more even. Resources are free on the Whole30.comm* although there are also books you can buy. My favourite books are The Whole30 and It Starts With Food.
Might be worth considering, even whilst you wait for your WLS?