Is it common to feel empty after crying a lot?

Absolutely! Often, crying seems to purge a lot of pent-up emotion; it can feel almost cleansing. However, if you find yourself crying frequently, please see your doctor -- it can be a sign of depression.
This can occur. Crying can be emotionally cathartic. Studies show that v tension ; negative affect occur during crying. Many people feel better both physically ; emotionally after crying. However, this is not always the case across cultures ; situations.