For the past few weeks for hours at a time I tend to feel queasy, but never the need to vomit. What can I do to ease my stomach and what may be wrong?

Causes of nausea. Nausea may be gi-related (food poisoning, peptic disease, gastroparesis, due to biliary & pancreatic disease, gas/bloat syndrome, small bowel problems). Consider "central" causes: motion sickness, vertigo, migraine headache, brain problems (some very serious). Also, rule out infection (? Urinary tract), medication side effects, pregnancy, & even reaction to stress. See your doctor please for eval.