You should consider talking to an attorney with a specialization in employee rights–specifically, accommodation requests and EEO complaints. While the activities you can no longer do could be argued to constitute “necessary job duties,” I’d argue that the accommodation would require little more than having an assistant or one of the other professionals handle those tasks for you. I don’t think they have much room to argue that an accommodation, in your instance, would impose an undue expense or hardship for the business.