Anxiety after breakup

Me & ex broke up a few days ago. It hasn’t been a week yet and this is the first time we’ve ever broken up for good. The first 2 days I couldn’t sleep. I’d wake up out my sleep sweating wishing I’d open up my eyes to a text. After the first 2 days I started to be a little more accepting. The end of this month would’ve made 2 years since we met. I started to just breathe & I stopped crying all day. It’s still hard to go to sleep , it’s still hard to not think about him but I get REALLYYYY nervous. Every time I open my eyes I am nervous. My stomach is always in knots I feel so numb and empty but I hate this feeling because it’s turning to physical pain. My stomach literally HURTS. when I’m nervous I use the bathroom ALOT. I’ve been going to the bathroom back to back , over 5 times a day it’s like I took a laxative lol. It’s really bad. This morning I woke up crying cause I’m so tired of this anxious feeling. It’s like idk what happens next. It’s horrible I feel dead but yet I’m still experiencing pain. The beginning I had headaches non stop, I was taking pain killers but now it’s like I’m soooo nervous so anxious 24/7 & I can’t help it. I’m always so worried like what’s about to happen. I need help has anyone ever experienced this before ?