Here are a few of my favorites which kind of go along the lines of something you might want to read.
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Ten Steps To Her Door by Nelles features a character in a wheelchair
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Last Moments by JayJay is about a girl who has cancer
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At First Sight by Trishy features a MC who is blind
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Speak by J Miley is a mental health story
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The Big Great by Sugarfoot Stories has a MC with kidney issues and a LI with depression
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The Gamer Girl by Wincy W: one of the LIs has social anxiety
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Dare to Dream by Sarah Robbins has an important side character who has Alzheimer’s
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I Need A Therapist by Clem doesn’t exactly focus on a specific disease, but its main goal is to educate people about certain conditions/mental health things while also having fun

I enjoy reading these type of stories. I’ll try to add to the list if I find or remember any others 