Hi! The bad thing is that you are feeling so poorly, with pains, pins and needles sensation,vision problems. The good thing is that you have an appointment with the neurologist. He can make sense of all those symptoms and advise you.
I am glad that your heart is fine. (It is just scary to feel anything around the heart area, I bet!)
Going to your neurologist is the very first step. Don't hesitate to tell him/her of all your symptoms. He will understand! He might send you for an MRI (magnetic resonance imaging). The name may sound imposing but it is just that we now have fancy technology to 'see' what is happening inside of people. He may or may not send you for an MRI . I don't know! (Big surprise !

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Take it easy this week and good luck!