What do you struggle the most when you become an expat?

Getting acquainted with the new country and new culture are the biggest struggles!

Language barrier-If the country has a different language- a word not known by you, it is very difficult to deal with locals.
Currency-It will take you few days to familiar with the new currency and its values.
Food & water- If you are used to a specific and selected food style, you can not take your meals from everywhere except going to a hotel with international cuisine.  you will miss a lot of local tasty dishes.If you are drinking only bottle water, you will have to carry a bottle where aver you walk (Fortunately our Asian tummies are tough enough to drink any water or eat any food and I always try new dishes!)
Transportation with public- Can you use a public transportation that is very cheap but not every country's is very comfortable.
Net access - Not all the places will supply you a good WiFi bandwidth.
Dust- Many Asians countries have a lot of dust and due to hot climate you will be sweating. OK for that??
Banking- If your credit card will not work for the new country's ATM, do you have other option? It happened to one friend of me.