Wow, so many people with the same problem as me. I've had this damn problem since I could remember, my mom even says only after a day of beingon this earth a open wind with some cold air blew in and boom diaper change. I get it when I go from hot to cold, when I get out of a shower I figured out to bathe with less warm water in winter so it doesn't affect me that much. Since I was born in Bulgaria and now live in America it happens everywhere it looks like, though I get it in America a lot more since they abuse the aircon here like nobodies business, and have to either wrap my belly with some blanket or go to the bathroom. Even when its above 90 degrees outside I have to have some blanket or sheet laided across my stomach to sleep or Ill be sorry. Doctors don't know what it is and jsut said do what you feel is best.
I will tell you that you are not alone. This has been going on with me for about 5 years and even though I use the word "cramp" to describe what is happening I do so simply because there is not another word for it- most of the time it is so bad I cannot breathe. do yours move? Mine will switch from my back to my stomach to just under my right breast to my arm and so on in a split second. I have been to doctor after doctor, and taken test after test, we have monitored my food, tested my blood levels many times, to no avail. I finally decided it was my colesteral medicine through trial and error, and quit taking it. This was not the case
So... You are definitely not crazy! This happens to many people and I am also one of them. What I know, from doing a lot of research and investigating it, is that this is something that we in Balkan region call reuma. The term is used for a state in which your own body starts hurting you because for a prolonged period of time it was exposed to cold. So once it is going on, every exposure to cold would make your bones hurt, your muscles to spasm ect...
There is no easy treatment for this but what helped me and some others is using tiger balm (or any heating cream). Apply it to the troubled area 3 times a day for about 20 days and it should relieve your sypthoms. I think in your case (as well is in mine) the muscles of the abdominal wall have suffered from reuma because of extensive use of AC or general overexposure to cold when you were younger.
You basically need to "extrude" this "cold" from your body and it will take a while. Try the proposed heating cream thing. I would say go to the oriental shops and buy tiger balm (comes in small, almost very small, doses). Do not apply too much since it is pretty strong stuff! :)
There is one more thing that could help since it is forcing your blood circulation to increase: after taking a warm shower, at the end, for only 4-5 seconds have cold water running over you. It is pretty much a shock (you can try ot out on your legs only for first time) but it will make your blood circulate better and help to warm up troubled areas.
I hope it helps, at least some of you! :)
Ivan
Horses also get something like this - colic - from drinking cold water after getting hot with exercise or when the weather suddenly turns cold