You may be highly spiritual. Spiritual people are not comfortable in their own skin. In the Adam and Eve story, after they 'transgress' (or discover an alternate reality) they figure out they are 'naked' and are given ‘skin clothes’ … they were bare souls now enclosed/enclothesed in skin/materiality. From that point on, life becomes very uncomfortable. Skin living is hard. Your soul/consciousness is perhaps just trying to expand and putting pressure on your skin sac.
Writing may be keeping you dwelling more on material thinking aspects; characters, settings, themes… and thus more anchored in your skin. Or just keeping your mind focused on something so that you don't feel that feeling as much until your brain is quieter and emptier.