No problem.... sounds like you need a bit of recovery time
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Hmm not sure. Elwing transforms into a bird but that is perhaps a rather different set of circumstances - by "grace" of the Valar rather than as an inherent quality. I know that Beorn seems to be a bigger bear than he is a man but somehow to me I find it harder to get my head around transforming into a creature of a radically different size - which is a bit silly if you have suspended disbelief enough to accept skin changing. I just have an image fixed in my mind of a six foot rabbit like in the James Stewart film "Harvey".