Prilosec worked well for me for about 8 months, now I'm having problems, increased the dosage and feel worse. Stomach pain with increasing nausea, after eating, and in the early mornings, tight throat, mucous in throat, constantly clearing throat, burning acid in throat, acidy taste in mouth, jaw/face pain, I just feel bad all over. The last 2 days I've had black stools also. NOt sure what is going on here, called GI and said to increase dosage, and wants to see me after 1st of yr, any idea's out there, of what's going on here ?