PPD/A 6months in?!

So I really thought I was in the clear for PPD/A. Then the last two weeks it's hit me like a truck :( my patience in non existent with my husband and older kids. I feel like an awful mother. I'm just moody and emotional, I had PPD with my oldest so I know these feelings. I can step back and see I'm being irrational but I just can't snap out of it. I'm trying to get outside and walk as much as I can. 
I'm so hesitant to contact my doctor, I really don't want to go on meds if it can be avoided. What are other mommas doing? Are meds my only option?