Hey there @Evie1 a hot shower is a good one. Sometimes it's good to just have a break from that overwhelming feeling isn't it? I can understand wanting to "numb" the effect, the main thing is doing it as safely as possible.
Are you linked into help professionals around this? A GP or Psych/Counsellor? It could be really good to have these discussions with someone who knows your history and knows the sorts of things that churn up this intense feeling. You've mentioned a hot shower works, have you tried breathing techniques and journalling? What other distractions tend to work for you?