Look at these sentences with aller:
In French, you can use the verb aller (to go) to make general statements about how you feel/are.
You can use it to express to feel/be fine, bad, better.
ATTENTION:
When you want to express specific statements with adjectives - I am sick/ tired/happy - you cannot use aller.
You'll use être (to be) instead:
See also Using 'sentir bon' and 'se sentir bien'
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