Dealing with Body Memory and Stress

hi. I haven't posted in a little while, but I'm really really stressed right now. one year ago today, I had to leave my favorite place on earth, leave my best friends, and go home from school/camp. I was at one of the lowest places in my mental health journey, and I didn't think I'd ever recover. I was hurting and didn't know how to handle it. I had to do classes online for over a month and a half, and I missed out on so much community bonding. now, one year later, I'm in a much better mental state, doing well by most standards. the problem is that my body decided that it wants to remember that time in my life and cause me pain and anxiety. just now, I went from totally fine, happy even (a rare occurrence most of the time) to extremely stressed and wanting to cry. unfortunately, I'm also about to get my period, so the hormones aren't helping my situation much. I just feel so exhausted and sad and stressed. I want to cry even though there's nothing wrong. I don't know what to do or how to feel better. I tried to talk to my boyfriend about it, but he doesn't understand because he's never had this kind of experience. he doesn't even realize that body memory is a real thing. I have one or two people I can talk to about it, but they're usually busy, so I feel very alone. how do I stop these feelings of sadness and pain and stress?