You are 40 yrs old, healthy and have the following complaints probably after a heavy dinner on the new year's eve
!) Pain in the Stomach
2) Pain between your left shoulder blade
3) Excessive Thirst
4) Itching all over the body.
The symptoms of bloody stool and diarrhea
is not there now.
What you need is basic blood tests, BP, ECG, X-ray chest - to rule out DM, HT and heart problem. Any problem - treat them.
If hyper acidity is there - regular bland diet, drinking plenty of water and avoiding spicy Fast food.
Pain killers and muscle relaxants if needed along with antacids
Find the cause for itching - diet, dress, atmosphere, perfumes like smell etc., and avoid it.