LL does NOT have to renew your lease, and does NOT have to give any reason for refusing to renew. It is LL's property and he has right to control who lives there.
Being disabled gives you NO special right to have a lease renewal. Your rights are the same as anyone else's. A LL can decide not to renew a tenant's lease for any reason or no reason at all, as long as it is not on a legally prohibited basis. Doesn't sound like it here. So suggest, you try speaking with LL and seeing if you can work something out, but go as petitioner, not as someone with Legal Rights making Demands. Tell LL that you were not being deliberately obstructionist and uncooperative (which he seems to believe with some reason), but that there was a huge miscommunication problem on your part.
READ your current lease. Generally a LL must give you X days notice before the end of your lease that he is not renewing it. Has he done so? You may be able to get an extra month of occupancy.
real estate investor