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Don't bottle up your feelings, it won't do you any good. What does this sentence really mean?
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It means 'don't try to contain your emotions or your expressions of opinion because doing that won't help you'
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Don't bottle up your feelings, it won't do you any good. What does this sentence really mean?

Maybe a word that describes ‘bottled-up feelings’ is repression? Would this phrase describe an angry person who couldn’t express his troubling emotions; a neurotic person? Actually, I searched for information about a popular idiom for ‘bottled feelings’ but I couldn’t find one. Can anyone help?
The actual phrasal verb is "to bottle up", which means "to restrain (powerful emotion)" or "to keep (an army or other force) contained or trapped". So, "don't bottle up your feelings" means "don't restrain/hold back/deprive your feelings/emotions".

Hope this helps! Emotion: smile