Myzen and JMO have given some very good insights.
I've practiced most of the examples they gave here for obsessive thinking. Today, however, driving back from Louisville, Ky, where I visited my twin grandsons, I was suffeing mightily from thinking obsessively. I talked to myself mentally, but, now home, it persisits. It actually started while I was there with the lovely 3 year old twins. I was using nicotine patches to avoid smoking around my daughter and her family, and think these may have triggered it??? Whatever, I'm struggling now, though I ripped the patches off last night.
Despite this little "setback," Yuki, I am doing remarkably well compared to how I was when I joined here about a month ago. I see that I am not alone, and neither are you. The feedback here is insightful and compassionate.
Seeker