Hi all your symptoms looks like sjogrens syndrome where the glands reduce or stop secretion and hence you feel dryness in eyes, mouth, skin and also nausea
due to reduced Gastrointtestinal secretion. You need further evaluation for this.
For now use plenty of water, hydrate yourself well. Apply vaseline topically to prevent dehydration
and use artificial tears
. Wear sun glass. These will help you.
Hope this helps.