What’s happening???

Does anyone know what’s going on with my body?? Like, I get cramps, in my ovaries and stuff, but I had my period last week, and I’m not pregnant, because I’m still a Virgin, and last night my stomach started to hurt, but like, only the “mouth” of the stomach, and Google says it’s acid reflux but I don’t really know how to treat that, and I woke up feeling anxious and my stomach hurts but like, it hurts like when you’re nervous, and I don’t really know what’s going on, I know I’m not sick cause I didn’t eat out, I just ate in my house, and my roommate ate the same and she is fine but am I just nervous?? Because let’s say this started at 8pm yesterday, at 6 pm yesterday I was feeling fiiiiiine, so now I don’t know, should I forget about it? Am I going to be fine? I’m a really anxious person, so the minimum “disturbance” makes me anxious, but I guess this is nothing right? I’ll be fine

Update: i Had breakfast and I had pineapple and a piece of toast and when I was eating pineapple I wasn’t feeling Really good and I think it past cause now I’m eating toast and I feel like I like I’m sick and I think I’ll throw up but it’s like so stupid I’m not sick so what’s going on? is it just anxiety?

Update 2: i’ve been feeling chills and my stomach feels kind of weird and I went to the bathroom and it’s like a normal poop but maybe it was the pineapple so I’m not really sure I still feel anxious and I don’t know what’s going on please help

Update 3: I remember I ate a lot of walnuts last night and yesterday so could That be it??