I wouldn't say I have official trauma but I have carried around an immense amount of guilt from my manic activities. I am 55 so that is a lot of manic activity. I kept all my behavior in my head and never told anyone because of the shame.
But I have started to tell safe people about some of it. I have documented plenty of it on this board. And I have found that my mania is nothing special. LOTS of people have done the very same things and many have done worse. This has made me realize that my behavior is part of my illness and not me personally.
Most of the people I hurt during mania are long gone from my life...so I have no need or interest in apologizing. Plus frankly, some of them deserved some of it. But for other friends who sort of drifted off during depression, I have written or messaged them and confessed my bipolar and asked them to understand what led to my poor behavior. All three of these people are now back in my life. It's like a miracle.
So my point to you is 1) life is short...forgive yourself for anything 2) people think less often than we think...half of them probably didn't know or care much 3) people can be brought back if you want that.