When we talk about flu like symptoms with herpes, we mean aches, fatigue, maybe a low fever, headache. We do not mean cold symptoms like congestion.
Green colored anything coming from your nose sounds like a sinus infection or something similar. You couldn't find anything about that related to herpes because it's not related to herpes.
You have a LOT of anxiety about STIs every time you have sex. Maybe casual sex isn't for you. That's okay. Also, are you seeing test results? That would help a lot of this.
Are you in counseling? You should be if you aren't, and talked to your doctor about your anxiety.