The exact meaning of the word "Heimweh" is homesickness.
The word Heim mean means "home" and the word weh means "woe" and when put together as "Heimweh" it means homesickness.
"Heimweh" or homesickness is a deep longing for home, family or one's native country.
"Heimweh" or homesickness can be felt intensely by someone that is far away.
"Heimweh" originally referred to a specific longing for the mountains that was felt by the Swiss mercenaries.
And over time, the meaning of "Heimweh" expanded to become the universal term for homesickness that we know today.
And in English you could say that he felt "Heimweh" or he was overcome with "Heimweh" for Colorado etc, which means that the person was homesick for Colorado when being away from Colorado.
When someone is homesick the person experiences emotional distress from being away from their home and familiar environment.
Homesickness can manifest itself as anxiety, sadness and withdrawal, along with other physical symptoms like appetite changes, sleep changes.
Homesickness is a natural and common reaction to change from one's familiar environment.
Although homesickness can feel overwhelming, the homesickness is only temporary and often fades away as you adjust to and build new connections in your new surroundings.
The sadness or unease you feel when separated from your home, people and routines that make you feel safe is homesickness and it's very common.