Damn, that sucks man! I guess there's only 2 things you can do in a situation like this...
1) cry in a corner
2) keep uploading, and power through it. Don't mind about the analytics

(I would probably recommend #2) xD
But on a serious note, don't take any action towards it. The botter will probably get bored and leave you alone after a while. Just keep uploading the same quality videos and I'm sure it'll get better
