Hello.Thanks for the question.These are serious symptoms.There are two possibilities which need to be considered.First is TIA and second is cervical spondylosis
.TIA - transient ischemic attack
, this is just short of stroke
and underlying cause is temporary reduction in blood supply to brain.This should be investigated with MRI brain and clinical evaluation.Cervical spondylosis is degenerative changes in neck vertebrae leading to pinched nerve
.Pinced nerve can present with such loss of power in upper limb.This should be investigated by MRI of cervical spine
.But if you are experiencing pain in right lower leg as well then possibility of TIA is more likely.I hope this answers your question.Please consider to see doctor sooner. Thank you.