Honeybun, so sorry to hear you have had this news, but remember it is more upsetting for you than your dog. She is living in the present; dogs don't compare 'now' with what they could do in the past nor do they worry about what might happen in the future as we humans do. Also, they have such an amazing sense of smell & this compensates a lot for loss of sight and hearing.
My old dog was almost completely blind and deaf for the last 2 years of her life. She slowed down a lot, as she had to find her way about by sniffing rather than sight or sound, but her tail was wagging right to the end. All I did was to take her mostly on the same familiar walks so she could find her way about easily. It's not boring for them, as even doing the same walk each day there are always new SMELLS! If we went anywhere new, I watched her extra carefully or kept her on a long lead, as obviously I had no way of attracting her attention if she wandered off.
The other thing I found was that she would become restless sometimes as she didn't know if I was in the room or not. Before she lost all hearing, I started giving her a special 'goodbye' touch on her head and say goodbye when I left the room - this meant that even when sight and hearing had gone, I could 'say' goodbye and she would know I was leaving. Coming back, she usually sensed the vibration from footsteps, but if she was asleep, I would put my hand in front of her nose so that my scent made her realise I was back. I would also often sit with her leaning against me or sitting on me, as physical contact became more important as sight & hearing failed.
So basically, focus on scent and touch rather than sight and hearing - think about linking 'words' she understands to touch, so that you can communicate if sight & hearing go completely - be prepared to be her eyes and ears in situations where lack of these senses could endanger her. Think of ways you can enjoy doing the same things differently - e.g. use some smelly treats to play 'hunt the treat' by scenting it. And keep enjoying her company. With a caring owner, there is no reason why a completely blind and deaf dog can't have many happy years of life.