I wasn't actually sick but I felt lousy.是什么意思？

I wasn't actually sick but I felt lousy.

我倒没生病，只是觉得很不舒服。

actually

adv. 实际上，事实上，确实，竟；

例句
How big is the abyss between what you think you are and what you actually are?
你对自己的认识和真实的你之间差别到底有多大？

sick

adj. 恶心的，晕船，不舒服的，腻烦的，生病的；vt. 吐出，追逐，攻击；n. <口>呕吐物，病人；

例句
A sick person needs absolute confidence and trust in a doctor.
病人需要对医生有绝对的信心和信任。

but

conj. 但是，而是，除了，只因为；prep. 除…以外；adv. 只，不过，只是，另一方面；n. 借口，推辞，但是，反对；pron. [关系代词，意义相当于 who…not, which…not]；vt. 对…说“但是”；

例句
English food can be wonderful but the normal English diet is abominable.
英国也有美食，只是一般的日常饮食太过糟糕。

felt

n. 毛毡；v. 摸索( feel的过去式和过去分词 )，触，深感，以为；

例句
She felt as if his words had granted her absolution.
她感觉他的那番话好似给她下了道赦令。

lousy

adj. 讨厌的，污秽的，多虱的，不清洁的；

例句
Claire, a poisoner? Don't make me laugh — She was just a lousy cook.
克莱尔投毒？别逗了。她只不过厨艺很差罢了。