I started taking 2 new supplements 4 days ago. One of them is for joint support, but i only take a fourth of the daily dose. And the other is a powder form multi-vitamin. Yesterday when i was running, after about a mile i started feeling this sharp pain on the left side of my stomach. And it happened again today while i was using the jump rope. I thought it was " side stitch " but i heard that usually happens on the right side. Does anyone know what this is?