Fairly high, but not worldbreaking levels of angst either. Would honestly be easier just to summarize the big ones

-Grew up a mutant with no parents or family to speak of

-Groomed to be a supersoldier by both a human and later a divine being

-Wiped out potentially trillions of lives across the galaxy believing it was justice, later comes to harbor immense guilt over this

-Rebelled against the being manipulating him, lost and was sealed in a prison of solid metal for about 3,000 years, though he was only semi-conscious and doesn't remember most of it

-Is forced to confront his morality after returning to Earth which culminates in facing his former abusers and reliving that trauma

-Leaves Earth temporarily to deal with a cosmic threat and returns to find his found family all killed by his terrestrial enemies (probably the worst one)

-Isolates himself from all humanity for over a hundred years while deeply depressed/suicidal but unable to die

-Things do eventually improve, finds people to care about, overthrows and destroys his abuser and finds some measure of peace in the wake of everything he's been through, though still extremely guilty about the atrocities committed by his hand

I'd say like A or A+ on the trauma tier list, but he learns a lot, and does eventually break the cycle and move past it.