It def sounds like you aren't having enough to me as well. I don't do aerobic exercise, but do loads of walking and find I lose weight well if I eat well. To fuel me I am eating a LOT of healthy food. I Have a nice average dinner plate for lunch and dinner. I tend to have salad or veg with either rice or jacket potato, and some kind of meat. Breakfast I tend to go for yoghurt and fruit or sometimes will have a cooked brekkie too.
A lot of people find they lose better for eating more. I am not sure how much you have to lose either, as I know everyone is different and has different amounts to lose and may not need as much as another. I Hope you have a better week, and maybe try fresh meat, salad and jacket potato etc especially at dinner as it will fuel your body better xx