scared

I googled this and it said it could be 1000 things lol. It’s not over water and I don’t have pests . So what could the issue be ? They don’t all have that purple lines either just this one mainly . Any help is appreciated greatly. Below is the plant and zoomed in to stem. She has some droopy...

So I just fed cha ching in the frist week of flower because I wasn't pay attention and thought it was open sesame. I realized my mistake about half way through and know I'm siting here thinking I just fucked half my crop. Can anybody tell me if this gonna cause serious problems down the line ?