Allow yourself to grieve because there is a new you. It may be pretty darn close to the old one, or possibly quite different. But then you have to get up.
There are many people who have brain surgery to remove an Acoustic Neuroma and return to life as they knew it. Not everyone is significantly altered. However, many of us are changed forever. It’s ok to be sad about the loss of our previous selves and lives. I found that it was helpful to recognize those differences, to grieve the change prior to accepting the new me. Then it was time to get to know the new me and move forward once again with life.