9 months in, how much are you eating?

I'm questioning whether my dietician is helping me or not. At 9 months I've lost 79 lbs. Currently 223lbs. I'm eating 90 g of protein a day, but that's all I can handle. Calories is around 500. I'm at 1/2 cup meals and sometimes can add a slice or two of fruit or veggie. Water intake is about 48-56oz. I just can't get more in than that. I work out/ strength train at least 3 times a week. I don't understand why I'm not losing more. Majority of the weight loss was in the earlier months, month 4-8 was just 25 lbs. Last month loss was 9lbs.

I've been more tired recently and never got that energy boost that everyone talks about. I'm concerned I'm not eating enough. My dietician said " listen to my body" when I asked if I'm supposed to increase food to a cup portion, but even then, I don't know how I would.

What/how much are you eating at this point?