I don't feel well yet.

我还是觉得不舒服。

I don't feel well recently.

最近我觉得不舒服。

I don't feel well. I'm going to the doctor.

我感觉不舒服。我要去看医生。

Linda: Yes, James. I don't feel well. My tooth hurts.

琳达：是的，詹姆斯。我感觉不舒服。我牙疼。

I'm ill. I don't feel well. I need a doctor. I must see a doctor.

我病了，我感觉不舒服。我需要医生。我必须去看医生。

Call in sick. Say, Oh, teacher, teacher, I have to take it later. I don't feel well today. And then study your butt off while you're busy being sick.

请病假。你可以说，“哦，老师，老师，我不得不之后再考试了。我今天感觉不舒服。”然后在装病期间，拼命学习，准备考试。