Not gaining weight! :(

Please no negative comments. I have always had a hard time gaining weight my whole life. I am a ftm was just told today by my doctor I am starving my baby because I'm not eating enough protein and not eating enough calories but I'm problem is I have been sick since day one of being pregnant. And you guessed I have lost weight not gained because of all the puking :( I eat all the time but I was told not enough and not enough protein. Has anyone else had this problem. Everytime I try to eat more I end up puking because my body can't handle it I guess. Any advice?? The pic shows me at 16 weeks and I look like I eat too much pizza :( help?! :(