Hello
I share your concern
History of weight loss 13 lbs with nausea and
constipation warrnats detailed evaluation to find out underlying cause.
I would advise you to consult your GP or family physician for a battry of tests like blood for hemoglobin, CBC, ESR, liver function test, blood sugar, serum amylase and lipase, ultrasound abdomen and endoscopy if need be.
You should not take diclofenac and tramadol empty stomach, along with these painkilles I would advise you to take antiacidity medicines like
pantoprazole or ranitidine group of drugs with antacids because these medicines causes
hyperacidity and can lead to ulcer.
You can take laxative or stool softeners like
liquid paraffin for constipation.
you can take antiemetic drug like domperidone for nauseating feeling.
you should take
dietary fiber supplement or lots of fresh fruits and vegetables.
you should avoid fatty fried spicy and junk food.
Hope I could answer your question, please do let me know if you have any more queries, I will be happy to help you.
Best wishes