This is a long approach that may benefit. I'd recommend doing in stages or very short sessions (maybe set a timer when starting for a short amount of time, such as 10 seconds to no more than five minutes, shorter is better when it's intense, which takes off pressure). The point is to reduce feeling overwhelmed, not increase it.
The feelings sound complex, and that's okay. Sometimes they can all want attention at once and lead to anxiety or flooding. These tools in the approach are what I've learned that have helped me manage and gradually overcome my PTSD symptoms, or at least feel more in control and less attacked by them when they arise.
Approaches:
Recognize the emotions/feelings. Don't put value judgments on them, just name them. Notice if you are not able to name them, and don't put value judgment on not being able to name them.
Recognize the physical sensations, maybe list them.
Focus on one physical sensation. Ask what it is trying to communicate. Be curious about it, no judgment.
Focus on one emotion/feeling. Ask what it is trying to communicate. Be curious about it, no judgement.
When feeling overwhelmed, or when the timer is up, do something that brings closure, like breathing, returning to the present, walking around, drinking water, splashing your face with water, sucking on ice cubes or putting them on your skin -- something that helps you shift back into the present. Maybe say thank you to yourself for listening, or thank the feelings for helping you understand. Then give yourself some time to physically and subconsciously process. Then repeat or progress the next time the feelings come up. Eventually if not right away, you may notice the feelings have less of a charge and are more manageable. Or they may get more manageable only to get strong again later, because they have more to tell you and you're more capable of working with them.