I wonder if anyone has any experienced this before. Since giving birth 4 months ago I have had 3 allergic reactions to going in the sea. I assumed that it was something in the sea as swimming pools were fine but a few days ago I had a quite severe reaction the an outdoor (cold) swimming pool. My whole body swelled up and I was wheezing, it was really scary. It got me researching and I'm sure it must be cold urticaria. Does anyone here have experience of this, and particularly postpartum? Did it ever go away? Cold water swimming is a big part of my life.