Answer:
Homesickness
Explanation:
It is likely that Cristian is feeling homesick. The lack of familiarity with his native culture is making him disillusioned and saddened by the cultural differences in the country he is living in.
Because of his homesickness and all that is familiar to him, over time in the foreign country Cristian feels distressed and depressed. The best he can do in this case is to prevent this from getting worse and damaging our stay in a foreign country. He should seek relief from bad feelings. For example, there are people who being in touch with their family and with objects and foods typical of their country feel better. In other cases, the ideal is for the person to move away from what may remind him of his country, in order to avoid an aggravation of sadness.