When you go through a threat/trauma situation, especially a protracted one, your brain can't process it until the threat has passed and you're safe again.
Your brain needs to keep you alive - that is its priority - so it can't let you start processing your emotions while you're still in that threatening position. It keeps you in survival mode and suspends the normal processing of memory into archives.
Now that you've come out of survival mode your brain needs to catch up with all that postponed memory processing so it can mark those events as "past" and archive them. Until then your brain still thinks those unprocessed memories are "live" and happening in the present.
So as it catches up you will also go through a catch up of the emotional processing connected to the memories. Sometimes that processing will be kicked up a notch if something triggers one of the unprocessed memories.
This is what is happening for you at the moment. It may not feel like it but it is a very good sign as it means a natural healing process has started. You're not crazy or weak, you're healing yourself which is great!
For most people it naturally resolves over a few months, but if things are getting worse or not improving after 3 months then ask your GP for help.
In the meantime, be kind to yourself (no beating yourself up about shoulda woulda coulda), stay connected to other people, find time to do things just because they make you feel good even if it's just sitting with a cup of tea ignoring to do lists.
Some people find a journal can help. Some colouring. There are also anxiety techniques that can help with soothing your nervous system or in moments of distress.
Do you know 54321? Notice 5 things around you you can hear, 4 you can see, 3 you can touch, 2 you can smell, 1 you can taste. Or match your senses up differently but the point is it grounds you in the present and helps the brain understand the distressing memory is not "live" anymore, not happening right now, and can be archived. You are safe.
Take care. You will come out the other side of this.