Based on your description, your husband still seems to be doing fairly well overall. He is still mobile and can go to the toilet on his own, has as good sleep schedule, and accepts food—all of which are good things and would argue that he is not yet in the final stages of the disease. Therefore, it is very difficult to say how much longer this current stage will last: it could be months or it could be years. The rate of disease progression varies considerably with each patient, and is not even consistent for any given patient (that is, a person may have stable symptoms for several months only to have a rapid decline over the course of a few days). So try to make the most of this time with your husband if or before he should become completely incapacitated.

Also, be aware that the medications your husband is taking may still be helping, albeit much less effectively than previously. Therefore, you may notice an increase in functional or behavioral symptoms once the medications are discontinued, which may make your job as a caregiver more challenging. You should weigh the potential advantages (lowered expenses due to not having to purchase the medications, no possibility of drug side effects) and disadvantages (possible increase in the severity of symptoms, more difficulty for you as the caregiver) of discontinuing your husband’s medication with his doctors before making any final decisions.