I haven't been hungry for over a month?

I normally eat fairly normal portion sizes at meal times, occasionally a little bigger than normal, but over the past month i have had to force myself to eat. Like all i will eat all day is a yogurt and a cup of cooked veg. I know its not healthy but if i eat any more than that it makes me physically sick. I don't have an eating disorder because i want to eat normally and i don't want to be sick but i just literally can't. I went to see my GP and she told me to force myself to eat more but that's just making me feel worse. Is there anything else i could try?
I haven't been hungry for over a month?
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