Thankyou for the question
As there is a system in our body which handles these symptoms is called Parasympathetic system.This is actually a part of a Nervous system which automatically controls domestic chores of body e.g..slowing
heart rate,digestion,excretion of urine feces and watering of mouth etc .If it gets disturbed, can cause changes in bowl habbits like yours,
indigestion,heart burn,thats why decreased appetite and so on..
In my opinion you should evaluate yourself ,if you are under any stressfull condition.Because stress can be the main reason , causing disturbance in parasympathetic system.
I would suggest you keep yourself relax and make sure of healthy living style,
as this is an automatic system so automatically will be resolved if avoiding factors which trigger it.
Regards,
Dr.Maheshwari