Welcome to Ja and thanks for this question. I'm sorry to hear about your symptoms. Actually the symptom which you are experiencing is referred to as polyphagia which means an excessive or increased appetite. Now while one of the most common causes for an increased appetite and weight gain is depression or even anxiety, it is important to rule out the other causes as well. One of the first causes which comes to mind is that you could have developed diabetes mellitus. This can cause an excessive appetite and also weight gain. This would be diagnosed with a simple hba1c test and also with the help of fasting blood sugar levels.
Another cause can actually be repeated fall of glucose levels which is stimulating the appetite center of the brain. It is possible that you glucose actually falls to low levels repeatedly and that stimulates the appetite, this would be confirmed by checking your glucose levels throughout the day especially when you get hunger pangs. If this is the case then it can be due to a condition insulinoma in which the pancreas produces excessive insulin.
Yet another cause could be a lesion in the appetite center in the brain such as the thalamus. This could be because of a minor blood clot damaging the brain or an occlusion of a minor artery. A simple mri of the brain would be diagnostic in this case.
disorders can also cause this and a simple thyroid function test is also in order here.
In short I think the metabolic issues should be considered first and if they are found to be absent then a mri can be considered and if that is negative as well then the cause is likely to be psychological and in that case therapy etc would be needed.
But first the other causes should be ruled out.
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