I can't presume to know the dynamics of your relationship so it's hard to give advice. From experience I can tell you it's tough. But possible. There were many times doubt and fear took over. I thought it would never work. Its a huge bomb shell to drop on a spouse. If children are involved it will make things worse. She could be worried about money, the affect on your children, safety and welfare of your children or what others will think. She could also be uncomfortable with her own looks, sexuality, and her self confidence could be shaken. If something makes her uncomfortable it must be addressed. All these things and more can be involved. It may be a knee jerk reaction and it may not be. I can say it is possible to save a marriage. But it takes an exceptional spouse and marriage and the williness to comprimise on certain things. The bottom line is you must make an honest assesment of your mental health needs vs the importance of the relationship with your spouse. If you value your relationship, listen to her concerns. They are valid and important too. I am lucky.
