They could be perimenopausal symptoms but then again not.
I have had the same ones you describe for a year or two and I am 46.
I was definitely sure that I had entered this new circle when I visited my gyno for a Pap test.
He was very surprised when he gave me an ultrasound. My ovaries were functioning at full capacity and he thought that I could still be ovulating for another 2-3 years. As for my symptoms they could well be hormonal flactuations which he could put right by some pills, which I thought I do not really need , so I didn't take them.
He also suggested that I could have a hormonal test to see whether my hormon levels were up or down but declined, because I want to take things as they come.
So, I would suggest that you do see your gyno and if you truly want to know what is happening ask to have the special tests available.
They say that the earlier you start your period the earlier it would go. And also it depends on the life span of your mother's period. But then, all these are indications not facts.. A proper test should put your mind at ease and PREPARE YOU PSYCHOLOGICALLY FOR THE CHANGE if it is happening.