I've been feeling pressure in my head, veins, kidneys, and heart less than a week after taking cortisone for some kind of blood test that my endocrinologist wanted to do. It all began when I felt pressure in my veins. Then I had a case of burning urination, which tends to give me episodes of anxiety, and this time I drank so much water that I was frequently urinating. Now I have occasional pressure in my kidneys and it's also getting to my heart.