Although it takes a bit more organising, it is possible to find suitable accommodation and travel if you have MND. Here are some places to start.
Ideas is a disability information organisation that provides information and assistance to people who are aged; have a disability, or are disadvantaged; their families, carers, supporters and service providers. Ideas provide a comprehensive list of accommodation and organisations that can support with accessible holidays. If you have an area or location in mind that you would like to stay then this will help narrow the search on the Ideas website - get started here Accessible holiday accommodation
TripAdvisor is a large travel website. When looking for accommodation, you can change the accommodation search parameters to include ‘accessible rooms’ and ‘wheelchair access’, but double-check accessibility with the accommodation provider directly before finalising any payments.
Air BnB is an accommodation site where you can search for accommodation. For accessible accommodation searches you need to modify the search criteria/filters by following the Air BnB instructions. You may also need to message the hosts to double-check they are able to meet your requirements.