Having nausea&bloating on/off for months. no other symptoms.diet is good. others docs say acid reflux & told me take probiotic. sometimes doesn't help?

Find symptoms' cause: 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. Find & treat the cause.