I've been dealing with this issue on and off for a while now where I'm experiencing high breathing and a high heart rate. An ECG showed sinus tachycardia. Lately, I've been noticing an increase in urine production and have been having some stomach issues. There's water vomit full of air bubbles and my stool and urine are also showing air bubbles, even though the urine tests didn't detect any protein. I've become very sensitive to the cold and have been having a low-grade fever that reaches around 100 degrees. Could you help me understand what's going on?