I feel sick as a dog.

我病的厉害.




I ate something bad, and now I've got the diarrhea.

我吃了些变质的东西.所以现在拉肚子.




I've got the runs.

我觉得我要吐了.




My head/stomach is killing me.

我的头/胃疼死了.




I think I've caught a cold.

我觉得我感冒了.




I have a running nose.

我流鼻涕了.




I'm too sick to even get out of bed.

我病得连床都下不了.




I ache all over.

我浑身酸痛.




I feel feverish.

我有点发烧.




It hurts right here.

就这儿疼.