Are there good alternatives to warfarin (coumadin) for blood thinning?

Yes: Bromelain, omega 3, delta tocopherols, white willow bark delta tocopherol is expensive and effective. I have seen muscle necrosis with coumarin - better to keep this short term negotiate with your pcp to switch this as soon as possible.

Depends: Depends on what condition you are taking it for. For a. Fib for example there is Pradaxa and few other medications.