First, sorry you're feeling so anxious.
Second, my last "freak out" was over leukemia as well, so I know how terrifying the feeling is.
My husband gets nose bleeds from time to time. Bad ones. It's probably just the dry air. Or a fluke thing. Nosebleeds do not equal leukemia.
The spots on your legs: think hard, have you noticed them before? This is what sent me into a tailspin, too. I noticed what I thought was petachie on my arms. Worried sick for weeks.... blood tests fine, and they are still there, nearly a year later. Just a thing on my skin. I'm willing to bet your spots have always been there too.
The other symptoms are all very much anxiety. Try some deep breathing, works wonders for me. There is even an app for it on android:-)
Cheer up, buttercup. You're totally fine. :)