Those are great positive steps you have taken OP.
I have a disabled DS, an asthmatic DH and I have a compromised immune system, so we really are the holy trinity for this virus, therefore I totally get where you are coming from.
I had a moment like you are having yesterday and I am usually one of the most devil may care attitude people you could wish to meet.
I found "doing" rather than "thinking" a huge help as for me the worst part is the uncertainty. I am not afraid of catching it, it is this awful sense of uncertainty about what happens next that is agony for me.
I Think we all have to acknowledge that the entire planet is in unchartered waters at this point and that alone is a massive stressor to the generations who have never been so better off.
Historically, there has never been a better time to be alive.
I imagine how many of us are feeling is exactly how our Mother's, Grandmother's and Aunties were when faced with two world wars.
A certain level of fear and anxiety is good, remember that. It enables us to focus on a solution and preparing for the worst yet always hoping for the best.
I also take comfort in the words my lovely late DM said to me once and that was that you never knew the real meaning of worry until you become a Mother.
Focus on what you can make happen here and now (as you are doing re the social media, I don't have it either) not what "might" happen.
I suspect we are all much stronger than we give ourselves credit for.
Good Luck.