I have had irregular periods, now feel nauseous?

I have had irregular periods, now feel nauseous. I saw my doctor about my irregular periods and she prescribed metformin for 12 weeks. After taken metformain for 4 days I feel nauseous, tongue feels like metal and is swollen and painful. What is going on? Should I consult a specialist?

Female
Age: 22
Medications: metformin

I have had cataract surgery and now my eye is red?

I have had cataract surgery as well as retinal detachment surgery about half a year ago, and been on Predforte eye drops since then. I met my eye specialist 3 weeks ago and she said I should continue to use eye drops for 2 weeks because there is a slight infection. After 1 week of no drops my eye is still red?? Why??

Male
Age: 37
medications: predforte

I have pain behind my left knee?

I have pain behind my left knee. I didn’t hit it, or had any specific accident. The pain just started to appear for no reason at all. It is a mild pain when I am sitting down, but it gets bad wehen I run and lift my foot off the ground. It gets especially bad when I cross my knee over my other leg. What can be the problem and how can I get it to feel better?

Male
Age:24
Medications: