It is okay to just BE. Just sit still and allow yourself to feel what you feel. No judgement, no blame, no shame. Feelings just ARE. Let them come, and let them go.
Then they don't build up steam in their internal hiding place. They get vented, and they drift away.
A very wise person told me a story that I believe is attributed to Buddha. When troubling feelings come, acknowledge them, but don't invite them to tea.
It is okay to process a little at a time, when you feel ready. I think Lillamy's analogy to letting the animals out of the zoo one at a time, in the right order, is right on.