Having started lifting weights, should I be increasing my calorie intake?

I'm 3 months post lap RNY, down 70 lbs. This surgery has allowed me to turn into an exercise nut: I do cardio (treadmill, crosstrainer, etc) 6 days a week for 45 minutes each time, and now I have just started lifting weights with a personal trainer 3 days a week. I'm feeling great but tired. I'm limited to just 300-500 calories per day, which doesn't leave me with a whole lot of energy. I will be limited to that amount until I am 6 months post. I have not had any problems with eating anything except chicken. I limit my carbs and get about 60-65g of protein perday. My personal trainer is worried that I will not be able to properly do the program he has designed for me with the current amount of calories I eat. I want to follow my MD's and nutritionist's guidelines, but I also want to get my body in shape as well as smaller. Does anyone have any suggestions? Should I just tell mt nutritional counselor that 300-500 calories a day is not enough? She says to keep it at that level but I don't think she realizes how hard I'm working at the gym (and i mean, I'm working HARD!!) Any suggestions will be helpful.

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