Homesickness is a negative feeling you get when you don't like the place where you are living currently and you wish you were back home. "After a month at college, she was very homesick." Nostalgia just means a pleasant, sad or longing feeling about a past event. You could be happy in the situation your are in and still feel nostalgia for a past time. It may or may not be connected with negative feelings. "That old tune gave me a feeling of nostalgia for the 60's"

Homesickness is when you miss the place you're from. Example: After staying in Portugal for six months, I got homesickness and wanted to go back to America. Nostalgia is the feeling you get when something reminds you of something of the past. Example: The old people were nostalgic when they entered the 1950's-style gas station.

Homesickness is considered as disease, which refers to a mental condition in which we can not live away from home, and feels severe want and wish to go back to home. While the Nostalgia is severe longing for past days of life. however the origin of Nostalgia is Homesickness. But this word has been evolved. Now a days there is big difference between the two. Homesickness: Longing for home Nostalgia: Longing for past I have 10 best definitions for the word Nostalgia. http://ourtopten.net/nostalgia-ten-best-definitions-nostalgia/

Anyway your Icon give me a nostalgic feeling:D