Hi squirtsmom, that's been a terrible stretch for you to contend with, and I'm sure that's just some of what you've been through. :(
You have mentioned that perhaps no one cares, yet if they are worried (or you fear they would be), then they must.
I can relate to the happiness (or lack thereof) part, but feeling depleted and overwhelmed, it's hard for anyone to feel happy.
I think the advice of giving the meds a chance, writing (or thinking) of things to be grateful for, interjecting soft things into your day, are wise suggestions.
Perhaps a feeling of purpose, some sleep, learning how to manage these symptoms, will help. There is hope.
I think ptsd interferes (GREATLY) with the present moment, more often than not. But in retrospect, future moments may not hold some of the joys or gifts that are there now. Other joys, or peace, or what-have-you, but not what is difficult to see now. Unfortunately (and I'm the worst offender), we usually don't realize what we 'do' have, until it's gone and we wish we had another chance. Almost like a question of relativity, perception, and awareness.
For some reason, it's been found that (as human beings), if we make a 'gratitude' list one day and the opposite the next, the items will be almost entirely the same.
PTSD, depression, are pretty much liars. You won't likely go back to being the same person you were, but you're becoming an even better version. :) Perhaps the old things no longer make you happy, but new ones will.
But I understand, I have battled SI, as many have here, and during it it's Hell.
About 30 years for the ptsd.
Best wishes and Hugs, if that's ok.
Welcome to you. :)