I suffered from severe bouts of depression...是什么意思？

I suffered from severe bouts of depression...

我曾患有严重的抑郁症。

suffered

v. 受痛苦( suffer的过去式和过去分词 )，受损害，变糟，变差；

例句
She suffered from anaemia and even required blood transfusions.
她患有贫血症，甚至需要输血。

from

prep. （表示时间）从…，（表示原因）因为，（表示来源）来自…，（表示分离）与…分离[隔开]；

例句
...an abortive attempt to prevent the current President from taking office.
企图阻止现任总统连任的失败尝试

severe

adj. 严峻的，严厉的，剧烈的，苛刻的；

例句
He had severe abrasions to his right cheek.
他的右脸颊有严重的擦伤。

bouts

n. 拳击（或摔跤）比赛( bout的名词复数 )，一段（工作），（尤指坏事的）一通，（疾病的）发作；

例句
I suffered bouts of really hysterical depression.
我曾患阵发的严重癔病性抑郁症。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

depression

n. 萎靡不振，沮丧，下陷处，坑，衰弱，减缓；

例句
It seems as if the blanket of depression is in some way necessary to help them blot out the even greater pain of real life...
似乎这种弥漫的抑郁情绪多少能帮助他们忘却一些现实生活中更大的痛苦。