Can anxiety symptoms manifest as (what would seem to be) neurological symptoms? i feel as if i am shaking internally, especially when sleeping.

Usually: An internal shaking sensation while sleeping is not known as a anxiety manifestation. You should talk to your gp, have a medical check up with labs and possibly your gp will refer you to a neurologist for a full neuro exam. Hope this helps! best wishes for feeling better soon.

Yes: Anxiety and stress can do almost anything however it's best to get checked out before blaming symptoms on anxiety.