This is really hard and it will pass. It's hard to get used to your new normal.
For today, the best thing you can do is to sit with your pain and feel it so it can pass. Do things that calm you, whether it's going for a walk or drinking coffee or hitting the batting cages or working on a project. Anything healthy that will get you into a flow state.
I know what you mean about "taking it well." Sometimes you just want your breakdown. So if you can, take your breakdown today. It will make tomorrow easier.
Then start making plans for living for yourself. That doesn't mean giving up or taking dramatic action. It just means giving you a direction to aim for in your new reality so you don't stay stuck in the old dead one. If your reality changes again you can adapt at that time.
Best to you on this rough day.
Me42, H40 D12, S8, S7 A revealed: 7/13 Sep 4/14; Agreed to D 1/15