HCG levels taking forever post miscarriage

So I tested positive for a pregnancy test at the beginning of sept, I was 5 weeks at that point. I soon started having bleeding and just felt something wasn't right. I was out of state for a week when I tested positive, so I went to a clinic to get a blood test, my HCG level was 85, I continued to have cramping and bleeding. When I got back home I went into my OBGYN, another blood test and it went down to 65, "not a viable pregnancy" I was told. My first misscarriage :( so then, I went in for ANOTHER blood test and I was at 66, my dr was going to schedule that I get a shot of...don't remember the name, but suggested i do another blood test. Another test and  then it was down to 45. 1 week later, another test and I'm down to 25. It's been 7 weeks now since my first test, and it's beyond frustrating how long it's taking, especially since my levels  weren't high to begin with. Going in for another blood test next week, for yet another reminder that I miscarried. Will be so happy when this is over and I can mentally move on.