If your son has ADHD and possibly ASD, to expect him to move out when he completes his course is unrealistic. From what you have said he has had no training in independence skills, you have not trained him to live independently, he doesn't pay rent, doesn't help around the house, has meltdowns, and needs medication.
My son had a similar diagnosis and even WITH training at home and his special boarding school 15 years later he still struggles. ASD doesn't suddenly disappear any more than ADHD does.
To manage alone you should be helping him to budget. To share bills, rent, and food costs. You need to teach him to cook, to maintain his clothing, safety and organisation of his home.
I'm not sure why you posted but I feel sorry for your children you may have paid for them, but that apart I can't help but wonder how you have supported your children into adulthood.
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