Hair loss can be due to a number of factors:  general health, hormones, stress, genetics, and scalp condition.

You've just made a major life change moving to the US, so stress could be a factor.

If you've changed your eating habits as a result of the move, it could be that you are not getting all the vitamins and minerals that your body needs to grow healthy hair.  A good multi-vitamin would certainly help in this area (and do no harm).

Your age would indicate that hormones are probably not a factor, and I'll take a wild guess that genetics probably isn't either.

You will see the most hair loss right after shampooing.  This is due to your massaging the scalp which will loosen any hair that is ready to fall out.  Try to be gentle on your scalp.  Don't use fingertips or fingernails.  Use the pads of your fingers to gently massage the shampoo onto the scalp.  Don't condition the scalp hair - this will only promote clogging the folicle's which can also cause hair to fall out prematurely.  Use conditioner only on the length of the hair (which is the hair that needs the conditioning the most).

You might also try vinegar rinses.  This can help remove any product buildup from the scalp and hair.  After shampooing, rinse with a vinegar/water solution, then condition.  The ratio of vinegar to water is up to you, I use a 1/4 cup of vinegar in a 2 liter bottle of water, then pour over the head (make sure to NOT get this in your eyes).

Try to minimize combing your hair when it is wet.  Hair is very stretchy when wet and will break easily.  Use a wide toothed comb that does not have seams that will scrape and damage your hair.

Hot water on the scalp is not necessary.  Try washing or at least rinsing your hair with the coolest temperature water you can handle.  This will close the cuticle of the hair which will help prevent moisture loss and make your hair more shiny.

I hope this helps a bit.  (Oh, and welcome to LongLocks!!)