Question
IF my begonia die will it come back?   I'm trying so hard to work with it.  Please help me.

Answer
ANNA,
I am assuming you have a Rex Begonia, probably Begonia 慍urly Fireflush? Type REX BEGONIA CURLY FIREFLUSH into your search engine to see if it matches yours.

They like partial sun, an eastern or western exposure. Rex Begonias can tolerate low light but perform better with some direct sunlight..

The watering care is similar for most plants (excluding Orchids, cacti and a few other special type plants). You do have to be careful to not keep them too wet because they can rot out easily. Water your plant based on how much it weighs when thoroughly watered VS when they are ready to be watered again. Plants die from too frequent waterings, not from how much water you give them at one time. Pick the pot up and feel how heavy it is after watering it thoroughly. Don't water it again until it feels considerably lighter and the soil top of the soil is light in color. Depending on plant types, sunlight exposure and pot size plants will need water at many different rates from once a day to once a month or more.

To answer your question about dieing and coming back. Rex Begonias have a resting period in the winter; at this time do not over water them. Give some direct sunlight. And do not keep them too wet or they will rot easily (This is the main cause of their death).On the other hand do not let them dry out completely for this will kill them also. They may not look real good during their dormant period but they will revive in the spring again.

Hope this helps you.
Rick in southern NJ.