What Causes Numbness In The Left Hand?
Stroke must be excluded.
Detailed Answer:
I read your question carefully and I understand your.
Given the abrupt onset of the symptoms the main concern is that of stroke. If the numbness involves the whole hand and not only those last two fingers you mention dropping I think it is the first possibility to be excluded.
Other less urgent possibilities would involve a peripheral nerve issue. Ulnar nerve compression would be a possibility given the involvement of the those fingers. Cervical spine issues with compression of a nerve root in the neck is another one.
While these last two do not represent an emergency and can wait for an appointment with primary physician, stroke is an emergency. I understand that ER is not close to where you live, but stroke is not a diagnosis to take chances with given the risk of disability it entails. So I would still recommend going to the ER for a physical exam about the nature of that numbness and weakness and to make sure there are no other neurological signs which would make brain imaging necessary. Hopefully given that the symptoms involve only the hand there will be no other indication of stroke, but I believe it should be excluded given the seriousness of the diagnosis.
I remain at your disposal for other questions.
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Detailed Answer:
That is good news. Since symptoms have completely subsided and you can contact your primary physician without much delay it seems the most reasonable course of action for now. Perhaps it is simply a transitory ulnar nerve compression while you were sitting watching TV.
Let me know if I can further assist you.