How Much Are You Telling?
If you fully disclose it gives you a chance to educate your employer about MS, how it has impacted you, and opens the door to communicate your needs as they come up. Staff at the National MS Society can help you with this. It also eliminates any speculation regarding your condition.
You may find that you get the support and assistance you have needed as well as welcome relief from the stress of hiding your condition.
Things to consider: Once it’s out there you can’t take it back. Your employer can have preconceived notions about MS and wrongly decide you will not be able to handle your job or additional responsibilities. You may try to educate your employer but may find they are not interested or open to the information.