You are suffering from hormonal changes causing Androgenetic alopecia 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, by direct online consultation for accurate diagnosis and proper treatment.

Hello. What you are trying to tell seems to be hormonal hairloss. Your hair gets oily due to excess sebum which can be managed with haiwash with appropraite shampoo at regular interval. But hairloss should be assessed.