I think I am ready to give up running entirely. I am getting slower and slower. Frustrating as hell.

Bummer, I hope you figure it out.

I took a look at your log 

I see the November time period you are talking about. It seems like right now you are running more miles per week than you have in the last couple of years, but the total mileage you have run over the last few months is at a low. Maybe not a great combination?