V.F.
I feel for you. I have not been officially diagnosed - however, I have many of the same complaints. (I did not notice them as early as you, but have noticed they are on the upswing.) I am currently 28 weeks along, and tend to have contractions (which my dr refers to as 'cramping') much of the time, especially in the late afternoon, early evening. (Although, like you, there are specific things that set it off too.)
They have been monitoring me because my 1st was 5 weeks early - so they were able to check cervical length, and it was not changing.... Hence the distinction between contractions and 'cramping'.
That said, it is not fun, or enjoyable. (This is my 3rd pregnancy, the 2nd was 39 weeks- although I was on semi-bedrest with #2 at 34 weeks due to this exact problem.)
So, the good news is that it is probably not something that you need to go crazy about. Baby is probably fine. :) To me, it was helpful to find out that other people had this happen too - and they were OK.
There is a website that is a bit out of date, but talks about this. It made me feel more comfortable that it was not all in my head. :) (Most people get REALLY worried about it, when I talk to them - or think that it is in my head....)
http://www.irritable-uterus.com/
Not sure any of that is of help, other than letting you know that you are not alone with this. :)