Thanks for providing more information.
Firstly unexplained weight loss, loss of appetite shouldn't be ignored as it can result in malnutrition.
As you are suffering from last few months so it's good to see your regular doctor and undergo further blood work like CBC, ESR, Liver function test, Renal function test, Ultrasound/CT scan whole abdomen for further evaluation.
Possible causes may include Gastritis, liver disorder, hyperthyroidism or anemia or vitamin deficiencies,cancer.
So having said this, I suggest you to make an appointment with your doctor rather than consider wait & watch approach.
I hope this helps.
If you have any further query then feel free to ask.
Positive feedback and bonus are highly appreciated.