You are suffering from hormonal changes causing telogen effluvium causing hair fall. It's completely stoppable even regrowth of hair is possible with certain medications without any side effects. Treatment depends on the grade of hair loss. So, it's a must for diagnosing which grade, you are in for an effective treatment. Please  send photos of your head for accurate diagnosis and proper treatment.

Excessive sweating is not a reason for hair loss. Associated conditions like dandruff etc could be. If u could visit us at the clinic we may b able to help u with the sweating