Here there are couple of possibilities with your symptoms,
You have symptoms of
numbness and
tingling in your hand, arm and feet more on left side of body, also headache, and heart burn after you eat,
severe fatigue, as well some times blurry vision for entire day. As per this you need to take following steps.
1. Check your eye sight and no. It can also cause hedache if there is weak eaye sight.
2. Check your blood pressure and blood sugar. This can be resion for headache as well fatigue.
3. Visit a neuro physician for proper examination for headache issue. If needed go ahead for
MRI scan.
4. Visit a orthopedic in case if numbness is also associted with pain in neck and back spine. Orthopedic will do certain physical test and may ask for some more scaning or x-ray and will give you treatment as per that.
5. If you always get tired withblittle walk and it use to be along with breathinh difficulty then you need to do ECG and treadmill test for checking out heart health. If there is any issue then visit cardiologist.
6. If nothing wrong with heart then heart burn could be just due to acidity and have anta acid tablet as oer your physician suggestion.
You can also improve your lifestyle by having food at right time and changing food preferance ti healthy and balance diet. also do regular walking exercise.
I am sure you will feel better when you follow all abive things with proper evaluation and treatment.
Take care.