What can cause temporary paralysis in one leg or arm at a time what can cause temporary unconsciousness what can cause instant hand or leg numbness what can cause instant, temporary swelling in the leg, foot, arm, hand what cause sudden immobility?

Many possibilities. Paroxymal weakness, numbness and altered level of consciousness are all suggestive of a central nervous system disorder. The altered awareness may suggest seizure like events. The periodic weakness, paralysis and numbness of limbs may suggest a warning of a stroke. You should seek formal neurologic evaluation.