Persistent nausea. Under medic!

I have been experiencing persistent nausea for almost a month, with recurrent vomiting, stomach discomfort, and difficulty eating despite feeling hungry. I have lost significant weight due to reduced food intake. I sometimes experience difficulty passing stool and incomplete bowel movements. Today, I passed stool 3–4 times after several days of difficulty. However, I vomited yellow, bitter fluid early this morning on an empty stomach after taking Pantotyd 40 mg. Later, I also vomited after eating a small amount of curd. Even drinking water sometimes worsens my nausea, and my food and fluid intake remain low. My CBC, KFT, and LFT reports were reportedly normal, but my Vitamin B12 (159 pg/mL) and folic acid (2.10 ng/mL) levels were low. Medicines from a nearby clinic have provided only temporary relief. I am currently being treated for anxiety disorder and sleep disturbance with sertraline 100 mg twice daily and propranolol as prescribed. I gradually tapered off clonazepam under medic