Aren't you feeling well 你觉得不舒服吗？
How are you feeling today? 你今天感觉怎么样？
Do you feel better now? 你现在感觉好点儿了么？
Any better 好点儿了么？
You'd better see a docter 你最好看一下医生
You'd better have a good rest 你最好休息一下
I hope you will be well soon 祝你早日康复
You are looking better day by day 你的气色一天比一天好
Take good care of yourself 请保重