Ok, so I thought your picture was familiar, and you're the person who was talking about your plateau and drinking only coffee.
I hope this doesn't sound too harsh, but what you're doing is simply unsustainable. It's not a matter of you having strong will to do it.
Your body will not let you get away with this.
I highly recommend you up your intake, at least up to 500kcal, trust me, that's so low. Then you can up your take untill you're able to eat 1000kcal.
Also, not only are you malnourished, but you're dehydrated. It's no wonder you're getting these symptoms.
I don't know your situation, but I feel like it's my obligation to say this: Please seek a professional. The fact that you're afraid of calories in water, of all things, should be more than enough to let you know this is far away from your control.
I wish you the best.