sick after eating breakfast?

Hi I'm new here, sorry for not introducing myself earlier lol anyway this will be fairly long so bear with me. I officially started my diet yesterday and for breakfast i ate egg whites, wheat toast, and oatmeal. I couldn't finish the oatmeal because it tasted just awful and my stomach started to turn and it felt as if i was going to throw it back up so i just threw the rest away. So that queasy feeling stayed with me, but I still went to work out for an hour. when i got home i was feeling so sick and my stomach was hurting so bad! I thought that maybe it would pass would a good nights rest, but when i woke up this morning i was still feeling sick and nauseating. So I waited an hour and decided to try to eat breakfast again. I cut out the oatmeal since I couldn't bear to eat it again. This time for breakfast I just ate egg whites and wheat toast, but still found myself feeling sick while eating it. It got to the point where i had to stuff the eggs down just so I could be done with the meal. My stomach was really upsetting me so I ate an apple and it did calm my stomach down somewhat, but i still was feeling sick. I went to lay down for a little while hoping the sick feeling will pass, but it didn't. It got to the point where i felt so sick that i couldn't even go to the gym today! So I was wondering why i was feeling sick like this. Is it because I'm starting to eat different things? Cause I would really hate if this is what I'll have to go through every morning. Even as i type this my stomach is feeling queasy and it feels as if i have to throw up. Is this normal when starting a new diet and will eventually pass? All comments and advice would be great! Thanks!