I have the worst motion and travel sickness?

For as long as I can remember I have had what I can only describe as the worst motion sickness, when I was a little girl I would tell my parents that cleaning my room made me sick – because every time I would bend down and get up or be up and down cleaning the floor I would get nauseous. This followed me into adulthood, my first job in retail I would dread working the shop floor because it meant bending up and down to pick up clothes and feeling hot, dizzy, nauseous. I also get the world’a worst travel sickness, even on very short journeys, if I so much as look down at my phone for a nanosecond, or a backseat passenger asks me something and I turn around – instantly I feel nauseous enough that I could be sick any second. Lastly, when I have stand on the spot for longer than 10 minutes or so, I get so extremely hot and dizzy that I could faint any second, if I can’t get a seat on the train to work and I have to stand on the spot, sometimes it gets so bad I have to warn the people I’m near that I don’t feel good. The minute I sit down I start to recover and normality returns, also freezing cold air can help me get through the sick feeling. Like I say I’ve had this all my life and I have no explanation for it, but it’s starting to affect everything I do, I can’t even hoover my house without dreading the feeling. I started to notice it when I was around 8 or 9 and I started having to do chores like cleaning my room etc, and now I am 26. Can anybody shed light on this for me?