Worried

I'm having awful stomach pain and nausea and it's really worrying me and scaring me

I’m anxious about HIV. What if I get it? That’s a scary thought to me. And then I’m scared/worried about giving it to others, not knowing if I have it, etc.

Can anyone validate my feelings/felt the same way. I overthink a lot about my relationship, but I especially worry my boyfriend will randomly change behaviors and become toxic. He’s never had toxic behaviors but I worry at some point in our relationship he could possibly change, and it consumes me sometimes.