2.I don't ever want to feel these feelings ever again.
まず言葉の説明：
みじめな思いをする-->"to feel miserable"
文法
もう二度も"ever again"に翻訳できます。
二度ともフランスに行かない
"I won't ever to France again"
Aしたくない
"Don't want to A"
バスをしたくない
"Don't want to play basketball"
１番目は直訳で"I don't ever want to feel miserable again"となります。
２番目は文脈を含めてもう少し自然感があるともいます。
「この気持ちを二度とも感じたくない」みたいなことです。
The emotions you feel that make you happy, lost, sad etc are also called 'feelings'
If you feel sad or lost you might not want to feel like that again so would say 'i never want to feel these feelings again'
喜び、喪失感、悲しみなどの感情は、'feelings' で表せます。
悲しみや喪失感を味わうと、「もう二度とこんな気持ちにはなりたくない」と思うかもしれません。次のように言えます。
'I never want to feel these feelings again'（もう二度とこんな気持ちにはなりたくない）
Miserable, agony and anguish are all terms used to express deep depression or unhappiness. Misery suggests that you are uncomfortable, while agony and anguish can suggest a higher level of depression, unhappiness and physical pain. You can say:
I never want to feel this miserable again.
I never want to be in this much agony ever again.
(The situation was agonizing)
"miserable"と"agony"、"anguish"、これらはすべて、不幸・深く落ち込んだ気持ちを表します。
"misery"は、不幸であることを表します。"agony"と"anguish"は、より深い絶望・不幸・身体的苦痛を表します。
例えば：
I never want to feel this miserable again.
〔訳〕こんな惨めな思いはもう二度としたくない。
I never want to be in this much agony ever again.
〔訳〕こんな苦しみはもう二度と味わいたくない。
（その状況は"agonizing"だった）
agonizing = 苦痛な
1. This strongly suggests that you are feeling extremely sad right now. "Misery" is a state of sadness, and feeling miserable is another way of saying that you feel sad.
2 The phrase "go through" is a common way of suggesting that you are experiencing something difficult, as if the difficult situation was a journey. In this context, it means to go through an extremely hard emotional situation.
I've suffered too many setbacks and simply can't face another!
I'm feeling slightly depressed about not being successful at anything. I don't have the strength to suffer another blow!
When you tried different new things, but failed at all of them, you felt miserable/lost. You want to say that you don't want to ever feel miserable/lost again. This can be either a very dramatic statement, or not, depending on body language and voice control. One of the above suggestions may fit a specific scenario.
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