For the reference, use
hBar=bar(X,Y,'basevalue',-100);
Doesn't move the axes but is probably the effect you're looking for.
Unless it's been introduced since R2012b, there is no 'textangle' property for the tick labels; there have been advances in using the TeX interpreter; you can always try to gussy it up via that option; I've not tried rotation to see if the builtin interpreter knows it or not.
Failing that, you can always use text and label the ticks manually. I'd guess looking at the image you've got so many that you simply don't have room for all of them irregardless of orientation but only trying it out will tell if can make them all fit legibly.
