Serious anxiety whenever I don't excercise?

I'm going through a rough patch where the girl I love doesn't love me back, and I've been trying to figure out what to do. Most of the time I can exercise myself into feeling okay, but on the days that I can't exercise like today, I feel like I'm falling apart. I can hear my heart beating, I go onto websites to check if this girl messaged me back, if she has then I feel relieved for a second but if I respond the I feel like I'm going to go crazy because I can't take not knowing what she'll say. I'm trying to figure out what to do right now, but it's literally all I can think about... is there some sort of pill I could take, food I could eat, anything to make this feeling go away?