<s>[INST] I have completely lost my appetite and have almost dropped from 9 and a half stone to 6 in the space of 3 months, I do no exercise whatsoever. I went from the 24th of February this year until 2 weeks ago without a period and I wasn t pregnant. My eating problem started out as I wouldn t eat meals and I d snack now and then throughout the day but now I go days without eating a bite and if I do eat it s out of pain I have to and it s only enough to fight away the pain. I also haven t been able to sleep properly and due to this I look about as bad as I feel. In the space of 2 weeks, 3 times before I go to bed I have taken some kind of fit which I don t know what that is either. Currently I get terrible pains in my chest, ribs and recently severe back pains, my stomach makes the sound of burning acid and feels like a bruise, hurts to stand up and move around, do you have any idea what may cause this and how to fix it? I don t understand what it is as I don t worry about my weight in the slightest, I have always been slim. [/INST] Here you are talking something about stone it's not clear. Is it something you are taking about kidney stone? As well there is no idea about your age, over all weight, how much it was ? And how much it is now? You need to provide your details properly. I will give here generalize answer since many things are not clear. For burning sensation in stomach, it can be acidity problem also, as well it can be gastric ulcer also, here you need to consult a doctor for evaluation and treatment. As well need to change your food habits. Keep snacks minimum, have more of cut fruits in diet. And keep one time for your food intake. Break fast keep it good, lunch keep it average and dinner keep it early by 8:00pm or before and keep it minimum. Next for your chest pain again it can also be related to gastric issue in your case. Since you are not more in weight and losing weight I am not suspecting anything with heart. But do consult a doctor if you start getting breathlessness along with chest pain. For your back pain if It's only at back then it could be related to spinal muscle weakness or over use soreness. Here you need to check on your working posture as well sleeping posture and the bed also should be suitable for spine. Detail guidelines you will get from physiotherapist. You need to visit physiotherapist and based on your back pain assessment they will suggest you exercise program which you should follow up. This will improve strength and stamina of spinal muscles. As well physio will only advise on ergonomic too, and you should follow with that too. Any time if you have radiating pain from back to legs with numbness do consult orthopedic too and go for needed test.Also, you can use hot and cold pack on your back for some more pain relief by relaxing and having soothing effect on soft tissues. Take care. </s>