我妈现在点国内有一种眼药水比较有用，大多数都没什么用。。。

我妈妈以前也会这样，后来坚持每天起夜的时候喝水是喝的蜂蜜水，慢慢就好了

Your Mom and Grandma both has those syndromes, maybe you can try to increase the home environment humidity as well.
Did they check out the disease called Sjorgren's syndrome.. or sicca syndrome. About 90% of Sjogren's syndrome patients are female.
 
Saltwater (saline) nasal sprays can help the dry mouth and nose as well.

你妈妈和奶奶的情况，除了以上mm推荐的药水。有一点要注意的是需要特别注意口腔卫生，尽量避免逆行性感染由口腔一起。另外，中药治疗以“养阴生津，清热润燥"为原则。

口干的情况，可以在国内买"舒雅乐"片口服，每日三次，每次一片

blesss