Paresthesia Anxiety Symptoms -- seems like the term/condition you are looking for (though I am not a doctor and am not diagnosing you as such -- I'm just trying to inform you of the term you might be looking for).
In this Wikipedia entry on Paresthesia, it describes the sensation as such:
Paresthesia is an abnormal sensation such as tingling, tickling,
The two proposed mechanisms for paresthesia/tetany secondary to hyperventilation are cerebral vasoconstriction and electrolyte imbalance.
Cerebral vasoconstriction: Cerebral blood flow decreases in a linear relationship to decreased PaCO2 (partial pressure of carbon dioxide). Thus, hyperventilation -> decreased PaCO2 -> decreased cerebral blood flow -&...
Very probably not.(1)
This sounds like an issue with nerves (especially a pinched nerve) that makes your Brain unable to "proper" communicate with your leg, hence the jelly-like feeling.
However, I would expect your leg to feel numb or "pins and needle" pain.
Not feeling your leg in the morning seems normal to me (i.e. paresthesia), but falling because you ...