Most hitches employ a removable drawbar, which holds the hitch ball. The bars come in two sizes: 1.25 inches (for lightweight pop-ups and bike racks) and 2 inches (for heavy loads). Hitch balls come in three main flavors: 17/8 inches, 2 inches and 25/16 inches. Generally, the bigger the ball, the more weight it can support. If you own two or more trailers that call for different ball sizes, I recommend buying separate drawbars with the proper balls permanently attached.
Occasionally, cardiac pain is felt only in the stomach and the diagnosis of a heart attack is delayed because people think that they are suffering from heartburn. Another common symptom of a heart attack is shortness of breath. Other less common symptoms include nausea, lightheadedness, or feeling cold and clammy. If you experience any of these symptoms, call 911 immediately.
I doubt it's cancer. Calcium and Cancer don't really have anything to do with each other. You could be anaemic, it could also be your blood pressure. If you are a hypochondriac, then the dizziness could be a sign of anxiety. In other words, you may have 'panic attacks'. It's not meant to be offensive, this is from experience (i have panic attacks myself).