What is this?

I have been working out a shit ton lately. I went from doing high rep calisthenics and a shit ton of cardio to do low rep calisthenics for mass/strength. I did a full body workout today, and jogging to the park I felt great, but once I actually started working out I felt sluggish, no motivation whatsoever. I even felt like I was going to pass out on my last few sets of pistol squats. I couldn't even force myself to jog home, and when I got inside I felt hungover. After drinking a protein shake I almost threw up in the kitchen, and I didn't even think of trying to have that post workout fap. Now, all through the day, I started coughing, even though I can breathe through my nose easily, I feel like I have old snot in the back of my throat. I have coughed so much my abs hurt a shit ton, and I also began to feel really cold despite my house being 72 degrees. Even when I bundled up under two blankets my feet still felt cold after 30 minutes. All I've really done after my workout is read, stretch, eat, and watch some tv once adult swim came on. What is going on lads? It feels like a more benign but longer lasting bonk after a long run, like a fresh hangover. Is this over training?