Sulpher Smell

[BrewTech117]

So here I am again this time with another possible problem. Im brewing a watermelon wine and have 2 five gallon batches going. My 2nd batch now REAKS of rotton eggs im using redstar (ill butcher the spelling since im on my cell phone) matriarch? Yeast which I heard is know to make this smell often but used it in both batches and my first one did not smell. I read to splash it from a carboy into a bucket and back again to get o2 to mix. And did this 4x but the smell is still there. Any help would be appreciated. Is my wine ruined?

 

[pumpkinman2012]

I'd add yeast nutrient asap. What is the SG? What did it start at?