There is nothing wrong with having a 'good' cry.
When I lost my husband, I had four young children, so, to avoid upsetting them, I'd go for a 'quick shower' and do my crying in there!
I was aware that it seemed very important to look after myself (and them) really well. I'm still sure of that.
However bad you feel, eat well, get out for fresh air/exercise, do things you enjoy, indulge in distractions, plan treats, anything that gets you through the day. You deserve it.
Never, ever forget that things will get easier over time.