I am so very sorry to welcome you here, but welcome nonetheless.
This is a wonderful community of amazingly caring and helpful people.
I think everyone has to deal with this in their own way. We all have different personalities and characteristics. What works for me might help or might not. I will share with you my perspective and perhaps you will find some value in that.
Many years before diagnosis I had accepted that life is temporary. We are all going to die some day. I did a pretty good job of pushing hard and getting the most out of most days. This served me well and I had a very satisfying life.
Then I started having some health problems and was eventually presented with my diagnosis. That was a pretty big shock, but I soon came to realize that I had two basic options. This first was to feel sorry for myself, wallow in my self pity, and find ways to just hang on until the end. The other was to continue on the path that I had always followed - to live each day to its fullest and get the most out of life.
Over a period of several months I developed a renewed focus on following the second path. I still have a very fulfilling life. I don't' feel sorry for myself at all. I know I am blessed in so many ways. I do try to get the most out of every day, though I know that sometimes the "most" is pretty limited. That is OK. I seek out ways to help others. I serve on a nonprofit board. I am active in church. All my family and friends know I am available for computer support. Whatever I can do, I do.
My motto is that I don't know if I can do something until I try to do it. This is tempered by avoiding putting myself in positions where injury could result (typically from falling).
We have travelled extensively over the last 2 years. The trips have been very draining but also very wonderful. I have had amazing experiences since diagnosis and look forward the the adventures that lie in my future.
Those adventures are now experienced from a wheelchair, but so what? In my wheelchair I can "hike" farther and faster than my wife or any of my friends

.
A key aspect to getting the most out of life is embracing adaptive equipment and tools. I bought new knives with handles I could grasp so I could still cook. We bought a trailer for camping because I can no longer practically camp with a tent (boy, do I miss tent camping). We have a wheelchair van to haul the wheelchairs around. I bought a four wheel drive wheelchair so I can be outside in our snowy winters and can do dirt trails and roads in the summer. I ski on a biski.
Everyone is different and everyone will need to handle this in their own way. Perhaps by sharing my outlook I can help your PALS to get the most out of the days ahead.
Steve