Hello,
Tab.
excedrin contains
acetaminophen and caffiene. Taking acetaminophen for long term may effect your liver health. In one day more than 2000- 4000 mg of acetaminophen is not recommended depending upon the condition.
Sometimes overdosage of this tablet may also cause
nausea,vomitting,loss of appetite,pain in stomach, dark urine,extreme
tiredness etc. symptom.
Long term use of this medicine may also lead to this kind of problems. If you are also using other medicines which have acetaminophen(cold,flu medicine may have acetaminophen), then chances of side effects also increases.
Sometimes due to this medicine
hyperacidity occurs which also leads to these symptoms. May be that is why you are feeling better full stomach.
As you have been using this medicine from 12 years so it might cause stomach or liver issues. You can consult your physician who advise you the tablet and ask for clinical examination and also for liver function tests as they will reveal the health of liver.
I hope you are satisfied with my answer.
Thank you.