Is it herpes simplex?

I came back from the hospital a few a hours ago. The reason I was in the being that for about 4 days now, I’ve had vomiting, nausea, dizziness, headache, muscle and bone pain, ear pains, coughing, runny nose, fever, chills, swollen throat, loss of energy, and this awful sore throat with sores all over my mouth. I leave the doctor, look at the papers, and see they’ve diagnosed it as herpes simplex. No where on that on that list of symptoms did it mention most of my symptoms. And when I Googled pictures, they looked nothing like my sores.
How could I have gotten it?
I have been dating my boyfriend for over a year. Everyone at his house was sick at the same time I started getting sick, so i assumed this was a cold he’d brought from over there. They all had fevers, runny noses, their throats were swollen, his grandma is still coughing, etc. They pretty much had all the same symptoms I had, but only his dad had the sores (they said it ws because of the chemo, he has cancer). And they were all given flu medication, they all got better.
I assumed I got sores because whatever they had was probably much worse to me, since I have the worst immune system. I live in Miami, Florida and a lot of people I’ve talked to about this say they’ve seen it, they’ve had it, they know about it. It seems to be something that’s going around.
I really think the herpes diagnosis was wrong, because my sister drank from my same water bottle, while i was sick, and she’s fine. My mom is starting to get a sore throat and some body pains, but that’s it.
What I’m worried about if it’s herpes are the future outbreaks. They look really gross. My boyfriend already knows about all of this, he and my mom were there with me at the hospital. Is it herpes simplex, or just a really bad throat infection?