"this emotion" is not wrong, but it is less common. Sometimes that is what you mean. There are many options. "I have felt irritated" is as if the irritation is coming from without, like if the weather is irritating, or other people are irritating you. Irritable is more like the emotion is coming from within.

Spring fever is usually associated with excitement, not necessarily irritation. I hope you'll get in better mood soon, take care.