Skin issues

I’ve always had sensitive skin so for years I’ve used all natural and gentle products.

In the last year I’ve had random bouts of really dry and irritated skin (my skin is naturally oily).

I use micellar water to wash my face and all natural shea butter to moisturize but my skin is still soooo dry and flaky and itchy.

I don’t have allergies and I drink 80-100oz of water a day.

I’m so confused and don’t know what to do. Any ideas of what this could be and/or how to fix it.