I’m not sure about seeing everything you’ve ever written all at once, but you can see all of the topics you started, replies created, subscribed and favourited threads by going to your name at the top right of the screen then hover over ‘forums’ in the drop down menu that comes up then selecting one of the sections.
What you could do is favourite all of the posts you created plus ones you replied to that feel relevant to your healing then look at them all together in the ‘favourited’ section. Hope this makes sense. I hope you are keeping safe, keep going.