Faith, it sounds like you're doing really well. But of course there will be lonely and low days. You're going through one of the worst experiences life can throw at you. I often find that calmness follows a really awful day, so you may have that to look forward to.
Any time you feel you can't go on, maybe do something nice for you. Even if it's just for an hour - run a nice bubble bath, have a cup of tea and read your book. Give yourself little breaks to keep on track.
But remember, your reserves aren't used up. You can do this...
T 13 M 7 Me 48 H 46 SS 15 BD 7.14 PA D final 5.16 (H filed)
We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus