My nail is splitting, i'm not in the greatest health but this is new and different, could it be a sign of something?

Stress & ill health: Those can cause nail issues but there are other causes of nail problems like fungal infections so please get it looked at by your doctor.

Get checked: While fingernail changes can't diagnose illness they can be associated with many different illnesses. It sounds like your health care could use some attention. Let your provider know of the changes.

Nails: that are immersed in water for long periods can split as they dry.