What's going on!?

Hey,

So I got my period last week, it was lighter than normal and only lasted 3 days. I have been feeling sick, dizzy, tired and moody for the last two weeks. last night a woke up through out with sweats and then later on extremely bad back pain (had to get up and stretch it was so painful.) I also noticed this blood on the bed when I woke up which wasn't there before (I'll post picture)

Anyway I am going to the doctor tomorrow but I was wondering if anyone else has had this happen to them and what the outcome was, also any advice would be appreciated. Thank you