Hat123 ,

Welcome. Caregiver burnout is real and will sap your own health.
MS is a stigma to some, it can mean the end of her social life. Even though their is no genetic inheritance, an MSer in some countries for example, can cause the entire family to be blacklisted from marriage and future prospects. MS is has been increasing in some countries. My MS Specialist has shared that the social stigma is really difficult in her ethnic community.
As to long term, fatigue is real. It is a burden we carry and non-MSers often have difficulty in understanding. Also, your wife may benefit from adaptive equipment to aid in her mobility or energy savings.
Your wife needs to speak with others. I would encourage her reading this site too. Your wife is probably depressed. This can be alleviated when she realizes that MS is chronic, that she is not "damaged goods", and that she can still enjoy life. Some of this entails getting through the social stigma of her community. Also, looking at re-defining her definition of normal. This will help her acclimate to the change and not grieve what she once was.
I would also encourage her to get moving. Start slow and simple. I have had MS for 39+ years. I have felt the social stigma from living some countries, but real friends stick with you. Cognitive exercise and physical exercise is beneficial to her.
Do not show her any pity. She needs to make a plan for her daily life. She can be independent. Yes, she will have bad days. I have Progressive MS. For me, I always have something happening. BUT by accepting certain limitations, my good days outnumber my bad days.
If she is having issues, an outside caregiver would bring you relief. Much of your feelings are caregiver burnout. I would encourage you to look at the caregiver forum. You need to be healthy. As to your wife, she can get through this. The MS forum is for her too. We do not judge and will support her as best we can.
Thank you for sharing.