Crazy Cycle

My period is driving me insane! Can anyone help me, please! August it came two days late. First day was painful and heavy, next light and gone. NOTHING for September!!! Came on October 2nd (which is strange when it usually comes on around the end of each month), but it was gone by 6pm on the 3rd. Am I really that stressed? That's what I've been getting told, but I'm not stressing nor worried about anything! I'm getting freaked out and about to go to the doctor.