How do I better control my patience?

I’ve been highly stressed out and sleep deprived since school started back again. I’m an extremely busy individual (involved in a lot of extracurriculars) and medical school isn’t exactly easy. Due to my numerous positions, I’m considered a valuable resource to ask for advice by people starting organizations or even for lower year students wanting to know how to succeed in a certain subject. Essentially I’m constantly being needed for one thing or another which also makes it hard to focus on studying.

Patience has never been my virtue, but as of late I’ve found myself increasingly irritable and impatient with others. These are people I care about but at the same time feel that I’m “too busy” to answer their inane Qs. Clearly I hate feeling like this and want to stop/prevent the quick curt replies that I’ve been giving.

Suggestions?