Welcome Aust, There is a condition called "NPH" that sticks in my mind, it's supposed to be rare, but can be missed if a doctor doesn't look for it/or consider it. Like BI...symptoms can vary between people, just wanted to mention it in case!!!
I've been triggered recently from a past event, but as my memory has improved over the years, my reactions to stimuli are different,so I froze first....then fight or flight took over...my brain was scattered all over/had flashbacks of the incident/then I'd start crying. The incident happened two months ago and it has taken every bit of that time to get myself grounded mentally. Now I have been having physical symptoms....muscle weakness/both arms and even my legs felt like cement/numbness and weakness...still monitoring if this is a stress reaction or not...arm weakness I've had before....legs is new...it was like I couldn't pick up my legs to walk they felt so heavy...cement legs!!
I just know my brain doesn't handle stress well at all! Hugs Aust