Restricted diet support?

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I'm talking medically restricted to manage actual diagnosed medical conditions before anyone starts wondering why the restrictions.

Is anyone else struggling with being on a restrictive diet? I have a list of things I can't eat without consequences which is as long as my arm and I'm struggling with motivation to stick to my diet.

I know if I have a 'trigger food' that I'll spend the next 2 days in bed in agony and a couple of further days feeling rough. So when I have something I tend to have everything I can eat before the pain starts. I can't just have a pizza, I have to have garlic bread, ice cream, chocolate etc with it. It's a vicious cycle I have fallen into in the past and broken, but I'm feeling a real loss of motivation at the moment and worried about falling back to old ways!