I was diagnosed with GERD ten weeks ago. I've been on omeprazole 20 mg for the first 4 weeks , increased to 40 mg the next 4 weeks, now back down to 20 mg. The mess have improved the GERD symptoms, but I am now having muscle & joint pain over the past week. Sporadic aches and pains in my hands, arms and knees. Anyone else with this side effect? And any vitamin supplements suggested that May help offset it?