To answer your questions:
1) There should be no reason why prilosec and zoloft can't be taken together.
2) It should be ok to take maalox after the two drugs are taken. However, since you continue to have symptoms despite being on prilosec, you may want to consider an upper GI series or upper endoscopy to evaluate whether there is another disease process going on.
3) Dyspepsia (i.e. upper GI discomfort that can include burning) is a known side effect of zoloft, affecting 1 to 10 percent of patients.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Thanks,
Kevin, M.D.