These past couple days have been so up and down for my anxiety. It will be getting better but then get worse at certain points

But these past few days, no matter how I feel, always around 7 I start to feel TERRIBLE. I get this pit in my stomach, and I get just sad and this weird feeling, it feels like when I used to be depressed. I hate this feeling so much. Also, for some reason I start to just hate everyone. Especially my girlfriend for some reason, it makes me want to break up with her and for some reason I just hate her and start to notice all her flaws. Like I can still talk to people and act normal, but on the inside I am so mad and irritable. Maybe it’s because my body is so exhausted from the day, I’m starting to notice how anxious and on edge my body is during the day, especially in school 

I don’t understand why I’m like this, it’s happened the last 3 days. I hate this and don’t understand why I feel like this. What is this? How can I help it?