When I was 8 years old (38lbs), I was on 180mg of prednisone/day. I have no teeth that are my own (though the ones I have now are beautiful), have broken a number of bones, my toes break regularly when stubbed, have heart issues, eye issues, skin issues, am now 40lbs over weight because I have prednisone forced on me when I wasn't capable of saying no and that's just the tip of the iceberg.
I'm one of the biggest proponents against prednisone for Crohns, especially now that there's a number of other ways to treat it - there wasn't when I was 8. I'm sorry if I'm coming off pushy or snippy, but prednisone is not a long term medication and shouldn't be treated as such. That you've been on it for so long and they're upped your done is very scary. That you have the shakes is a hint that this isn't the right med for you.
Please, please talk to your doctor about different forms of treatment.