In my experience, there are several reasons other than tension for hair loss. Most of the people from Nepal after coming aboard, they take a bath in hot water that helps to loss hair. Try using slightly cold water to wash your hair. Next is the use of suitable shampoo. If the shampoo you are using does not suit you, it also helps to loss hair. You should try several shampoo (for some people try soap). In my case I tried some expensive shampoo but finally a cheapest one SUAVE worked well.
Wearing woolen or polyster cap is also not good to save hair.

If you have daindruff, you can put some oil before taking shower.
Hope it helps.