I say lying comes back to bite you 99% of the time and to mis-represent yourself intentionally can lead to automatic dismissal later on. If you are going to lie, make it a lie of omission. Just dont tell them you have MS or cognitive issues. or you can wait to be fired from your current job and collect unemployement yes? This will give you pay while you search for work.

I would reccomend talking to your current boss or bosses. Explain to them what is going on. the ADA says that they MUST provide accomodations for you. They may be able to hire an assitant for you, or find computer programs to help you keep track, or even someone from the MS society may be able to come teach you better work habits. This way you wouldnt lose out on your paycheck, current job and would be able to keep up.

If you are so fed up you simply want to jump ship then be prepared to answer why you left a high position and want one lower on the ladder. A quick explaination of the stressors of the higher level rungs on the ladder is usually enough to elicit sympathy from others without having to play the MS card.

Either way I wish you luck. its so hard to keep working in a spot that you feel overwhelmed in, and when bosses or co workers start pushing it doesnt help.