From what I understand, you can be sero-negative and still have. @Memmsw: are you on the white pill Mestinon, or the time released version? If its the white pill, they only last so long, and yeah, you'd be drooping again pretty soon. The time release works much better (and of course, more expensive).
If I don't get back to y'all before then, a very Merry Christmas to you all!