my pulse today is 134 beats per minute, I have a huge amount of pressure on my chest, it feels like an elephant sitting on my chest and I am having difficulty breathing. My jaw on the left is becoming increasingly sore, and now I can hardly open it. I have renal tubular acidosis and am on potassium supplements, but have been nautiaus and haven't been able to keep them down I am worried about my shortness of breath, i am ok when in bed, but the minute i get up it starts