Thanks for asking.
Based on your query, my opinion is as follows.
1. Greenish stools is due to increased motility of the intestines with malabsorption
2. Unless, you are allergic to instaflex, it appears to be coincidental.
3. Get eosinophil
levels checked. If normal, not to worry. Also see, if you have any breathing difficulty.
4. Continue with instaflex, its good for joints. Not related to instaflex.
Hope it helps.
Any further queries, happy to help again.