I pulled my drain almost all the way out by accident. No suction at all now. How will they fix it?

You provided information that is important and valuable. You should ask these questions to your plastic surgeon, the person that will know the answer.  

I'm sorry to hear about your accident.  But try not to worry.  The first thing is to contact your surgeon and get their advice.  They will be in the best position to know your situation and help.  Pulling out a drain, accidentally, is not uncommon and most patient still do fine.  Best wishes, Dr. Lepore.

First and foremost call your surgeon and get their advise.Since it has been in awhile they may just pull it out or depending on your circumstances might replace it