Your hCG is increasing normally, which is a great sign. It doesn't mean you definitely won't miscarry, but I think it's safe enough to assume that you're not *currently* miscarrying and that the cramping is due to something else.
However you're probably not doing yourself any favours with this level of stress. Have you spoken to someone about your anxiety? The risks of early pregnant can be stressful, but they're also completely out of our hands. There's nothing you can do to make a pregnancy stick or to stop a miscarriage that's underway, and while at face value that sounds like a negative it actually isn't... It means you're allowed to relax a little and let what will be, be.