Thank you for your comment :)
I would say yes, you should consult your physician. The pain in your abdomen without being able to produce any stool could be related to an impaction or blockage in your bowel. This is reinforced by passing out most often caused by vagus nerve stimulation. Of course this is all speculative until talking with your physician and having them evaluate you.
Your symptoms are identical to my symptoms of low-blood pressure and dehydration. I know now how to recognise the symptoms and the first thing I did after the dizziness, fainting, sweating, and shaking chills, was to check my blood pressure. My BP was 67/58/70. A normal BP is about 120/70/70. I began drinking 8 glasses of fluid a day for a week, and all the symptoms disappeared and I felt fine. Try flavored water to help you drink the daily amount of fluid.
A pain in the stomach can be caused by several digestion disorders. If the pain is a burning pain that goes away after eating, you may have Gastritis which is inflammation of the stomach lining. The symptoms are similar to an ulcer pain. Acid reducers like OTC Prilosec, Prevacid, Zantac, and others can stop the burning pain. If the pain continues after taking acid reducers, you may have an ulcer and need to consult a doctor.
Mcdee