Hi, I'd like to help you with your question.
It sounds like from what you said that you are concerned that this man is no longer interested in having a relationship with you. I can see at least four possibilities as to why that might be so:
First, he asked you for date, became scared of the idea, and backed out.
Two, he really was ill and needs more time to recover.
Three, he needs time to think through his options and to deal with any emotions he has about starting a new relationship.
Four, he may not be ready right now to start a relationship.
It would not be unlikely that he is concerned that you may not be aware of what you are getting yourself into with his disability, particularly if he is newly disabled. Handling a disability such as paralysis is hard and the complexity of emotions and ability to handle relationships would vary greatly from person to person, depending on how they reacted to their situation.
If you feel comfortable doing so, I would contact him once more, explain how you feel and leave the decision up to him. He may need time to decide how to proceed or he may feel uncomfortable at this point starting a relationship. Either way, you have tried and it's up to him to connect with you if he is willing.
I hope this has helped you,