Un-diagnosed Throat Symptoms

[Shayy316]

About a year ago I got a sore throat out of nowhere and about 3 hours later I started feeling sick so I went to sleep. When my mother woke me up about 5 hours later I was extremely sore, could barely move, I was really weak, throat hurt to the point I couldn't swallow without tears instantly  coming to my eye and I was running a fever. My mother took me to the doctors the next day and the doctor said my throat was almost closed off. My throat was really, really red and I believe there were white patched in the back of my throat too. He checked for strep throat but it came back negative. He said I had a full body infection and he gave me antibiotics and about a week later it was gone. I came back about two months later with the same thing but not as bad as before but he was surprised I had it again so he checked for two types of mono and strep throat again but they came back negative. I did a urine test and a blood test and he said it wasn't infection either. It wasn't contagious either as I was the only one in my house who got it. I haven't gotten it in over a year but it still bothers me we couldn't figure out what it was. Do you have any ideas of what this could have been? Thank you.  

[Shayy316]

Thank you.