NC'd for this - feel I should know better 
I recently had DC2. Since about halfway through my pregnancy I've found it increasingly difficult to parent DC1 with any kind of positivity. We end up at loggerheads most days and I get so angry so quickly that it quickly descends into a horrible environment Am starting to wonder if I have pnd, but then I think I'm just looking for an excuse for my horrible behaviour.
Anyone experienced anything similar or have any tips on how I can get back to being a loving mummy again??