What's the matter?  怎么啦？

I feel very weak and I often suffer from insomnia.  我觉得身体非常虚弱，而且我经常失眠。

To be honest, I have to tell you that your temper is variable recently.
老实说，我必须告诉你，你最近性情多变。

Really? I didn't realize it. I don't know why I became like this.
是吗？我没有意识到。我不知道为什么会这样。

I suggest you should go see a doctor as soon as possible.
我建议你尽快去看医生。

Maybe I should.
或许我真的应该去。