Paypal took money out of my bank I didnt have?

So I just created a Paypal so I could finally start selling on eBay At this time there was a minuscule amount of money in my checking account (most of the reason why I sold some stuff). I finally sold my items and sort of received my Pending money from Paypal. Next I decided to print the shipping labels at home to save some time and money. When I bought them I assumed the money would just deduct from my pending paypal balance. Boy was I wrong. Apparently the money was taken right from my checking account which had no where near enough money to pay for the lables. So once the buyers get thier packages I go over to my paypal account and see my pending money turned into real money. So im all happy until i realize the shipping label fees were not deducted from the net total. So im like whatever I thought I lucked out or something. But then I go to my bank account only to find Im negative nearly 100 bucks from NSF fees because the shipping fees came from there and not paypal. Im pissed to say the least. Basically I'll be lucky to break even if this pans out right. Basically I'm just wondering if it is even worth my time to call up Paypal and ask for money to pay the NSF fees. The whole thing is bullshit.