Yea, I really don't eat a lot of meat. I get 75g protein during the day from a whey shake (3 scoops), I have a few glasses of milk per day, I eat some meat but not a lot. I don't even always have meat for dinner. My wife likes to cook with vegetables and grains mostly. And then on days I work out, I get an extra 15 grams of protein from my workout shake. So on most weekdays, I'm probably getting 120-140 grams of protein, depending on what I eat for dinner.
On weekends, I don't drink my weigh shake, but I drink more milk to compensate. So on weekends, I'm probably at 100-120g protein.
I eat A LOT of carbs. I'm drinking a milkshake right now, and eating french fries while I type this.
2 weeks of not eating well dropped your 5 rep squat max by more than 50 lbs? That seems unlikely. How consistent are you with your squatting depth?