Weight gain

I am struggling. I am over weight, 5'8 and 215 before pregnancy. I have gain about 10-15 so far in this pregnancy (20 weeks). My doctor only wanted me to gain 10lbs for the whole pregnancy. I just want to eat eat eat and I want crap. My first pregnancy I did not crave such bad food and I was 195 before pregnancy. 
Please tell me I am not the only one. I feel so bad about it all, but the craving is real! I am nervous about all the weight I am gaining.