Every now and then I get nausea after a workout, I've always assumed it meant I worked out especially hard that day.

However, today I actually got sick and lost my breakfast & post workout shake. Felt fine immediately afterwards but it was still pretty annoying.

it's possible that I may have simply worked out too hard. I pulled a back muscle 2 weeks ago and it's been slow to heal so I've been taking it easy, no running, no yoga, no crossfit, and easy on the weights. Today the back felt fine so I went beast at the gym.

Obviously I did too much but is there a scientific reason to this? I was in a hurry this morning and had 6 eggs (4 whites:2 yolk) and 1/2 cup cereal 1/2 cup 1% milk 40 mins before workout and, I don't know, 20-30 ounces of water throughout. 15 mins after I had my protein shake but didn't add anything, just 1 scoop and a glass of water.

Thanks for any advice