+p/qcalcium channel antibody. Possible lambert eaton syndrome doc thinks. No malignancy. Being treated w/ ivig & starting rituxan (rituximab).? What is this etc.

Get a second opinion. I do not understand your health problem because we need a lot more information to make a correct diagnosis of such rare conditions as you have listed. I would advise you to seek a second opinion from a hematologist /oncologist in order to find out what exactly is wrong with you, before taking such powerful medicines as you have listed..