Extreme hunger during pms

Hey guys I'm currently 3 days away from my expected period and I have extreme hunger and a weak shaky feeling. I feel like I need to eat every hour and I feel like I'm going to collapse unless I do.

I have sex on a regular basis but we always use condoms. I took a pregnancy test today and it was negative but I took it mid-day. I also have swollen breasts and some cramping in my lower abdomen.

Does anyone else get like this before their period?