Our expert says:
Very difficult one. Any chance it's impact and collision related? That woudl be a form of motion sickness, which it might be, and I'm not sure how you managed to figure out that it's not. I wonder also what would happen if you did another sport, like say squash, for 40 minutes. Would you get nauseus then too? If so, then motion sickness may well be the cause. Otherwise, collision in tackle situations could explain it. Overhydration is an interesting one, and again, I'm not 100% sure how you eliminated it as a possible cause? The fact that it goes away after being sick suggests it's related to the stomach contents, possibly caused by over-hydration.
Difficult to say, even with all these theories, what the solution might be. Obviously, that's what you're after. Have you tried not eating anything before playing? Alternatively, you might try something salty? During the game, that is, instead of things like Energade or Coke, which is usually what people will drink.
Short of this, medication to prevent nausea seems the only option I can suggest...
The information provided does not constitute a diagnosis of your condition. You should consult a medical practitioner or other appropriate health care professional for a physical exmanication, diagnosis and formal
advice. Health24 and the expert accept no responsibility or liability for any damage or personal harm you may suffer resulting from making use of this content.