What does burping and light headed mean?

What are the valves in the veins called? What next in triplets? Which division of the autonomic nervous system is characterized by short preganglionic and long postganglionic fibers? What is flucloxacillin taken for? Is the soda squirt a good drink for the flu? What is bilateral lower leg cellulitis? Is it weird to have a weirdhatred of when people dont trust you? What kinda discharge is a preg sign? Can you wear monthly disposable contact lenses on approx28 occasions regardless of how many days they're not worn in between or do you have to dispose of them after a month even they're only worn once? Which form of cancer kill the most people? What if your eyes sometimes wont focus like when im reading a book with small print for just a split second everything will go blurry does anyone know what this is could it be a stigmatisim? What do the ventricles contain? Can you have pregnancy symptoms at 4 weeks? Is an aortic aneurysm the same as mild tortuosity of the thoracic aorta? Is it normal if you're 25 and you have 4 children the youngest of which is 3 years old and you did not breastfeed him but you are still producing milk and you also had a hysterectomy? How does inhaling carbon decrease the oxygen level in your blood? How did most soldiers die in World War I? If my son has reactive protein high in his blood what does that mean? What is the biggest walled park? What mineral helps offset some of the effects sodium has on blood pressure?