Thank you for asking your health query here. Here is the probable diagnosis of your health issues
You are telling of stomach ache and loss of appetitive in a few days interval and earlier you have also loose motion
problem. You have already completed all the investigations. So your health issues of stomach ache and loss of appetite is due to interruption of rythemical peristaltic movement of our G.I.Tract (food pipe). It is called Irritable Bowel syndrome
(IBS). In IBS there are pain with loose motion, loss appetite, sudden urging for bowel clearance in few days intervals. Some persons expereince of loose motion altered with constipation
. The causative factors are mostly psychological related like staying in constant stress or anxiety state, depression etc. It is advised to take fibres rich diet, drink more water, daily morning walk and yoga, do meditation
, medications includes anxiolytic groups etc. In homeopathy
and ayurveda IBS has good medicines and can consult to any qualified homeopathy or ayurveda too.
Hope this answer would be helpful for you. If you have any further queries do not hesitate to ask me.