I’m a teacher and I have some experience here. I teach fulltime in a high school. There are a lot of different accommodations that you can ask for. In the past, I have had to sit students in specific seats, make different types of tests for them, give them word banks- essentially make the assessments easier. For some of my students with mental disabilities, they are allowed to go to the nurse/bathroom/get a drink without a hall pass. When the work is particularly challenging, I allow them to work with a partner. You can also request for your child to have a study guide made before tests. I also had a student who was allowed to retake quizzes and tests if he did poorly. You can also allow for a no penalty for late homework. I typically tell my students to just put all missing work in a bin when they enter the class. Like that, they don't stand out or feel different.
If they are too sick to attend school, I would highly recommend k12. I was briefly employed with them as well and they are wonderful with students who have disabilities. It’s completely free public school online within your state.