Lol. No, marginally improving your already insufficient egg intake is not causing a sugar crash. Try eating six eggs, or maybe a dozen to put some weight on, with some fruit and nuts at the same time so your body will store something for later. If you want to gain weight quickly, simply eat a lot of fat and a lot of carbs together often.
Steak, eggs, potatoes - fruits, nuts, berries and forage. Coconut milk and potent herbs and spices. Tea instead of coffee now and teeny amounts of kelp daily. Let's see how this does! Not really had dairy much, and gut seems better for it.