First of all, keep in mind that I am unable to diagnose you because I am unable to examine you, this forum is for educational purposes.
Multifocal Motor Neuropathy (MMN) with conduction block is an immune related disorder that generally responds well to treatment. This is a pure motor syndrome and presents with asymmetric weakness and atrophy, usually of an arm/hand. This condition is most often diagnosed by EMG and nerve conduction studies, but is also associated with positive GM1 antibodies that help to differentiate this disorder from other similar disorders such as ALS, compression, CIDP etc. The treatment consists of IVIG (often very effective) and cyclophosphamide. The clinical presentation that you describe sounds consistent with MMN with conduction block. I would recommend sending the anti-GM1 antibody test and a trial of IVIG (intravenous immune globulin) followed by cyclophosphamide is needed.
I hope this has been helpful.
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