About a week ago I was sick for a few days (mainly, I had a sore throat, no appetite, and I was really tired). I thought it was gone, but the sore throat came back a few days ago. Mostly, it hurts to swallow. Now, I've started getting all these random pains in my joints - yesterday it was just my ankle, and I thought my shoes were irritating my feet, but I changed shoes and it hasn't gone away. Now both my knees hurt like I fell and landed on them on them (but nothing like that happened) and one of my elbows hurts.

Anyone know what this could be? I thought maybe the flu when I was sick last week, but I got the vaccine, and it seemed to go away quickly. I'm not tired, congested, or nauseated, though.