The most common medical cause for sudden loose stools is acute gastroenteritis, usually as a result of exposure to gastrointestinal pathogens such as viruses and bacteria. Sometimes this may be accompanied by fever, vomiting, abdominal cramp and loss of appetite. These symptoms usually will resolve with adequate rest and hydration (drinking enough fluids).
In your case, I will recommend at least a GP consult as you are complaining of fatigue (feeling weak). It could be a sign of inadequate hydration or even loss of body electrolyte (due to loose stools) for which more targeted treatment is indicated.
Your symptoms (cold and weak, neck ache) are non specific and may occur in many other medical situations (such as spine issue, muscle strain etc). In any case I recommend that you see a doctor to get a complete history and physical evaluation then decide what investigations or treatment is required further. As for your gastric pain, have you seen a doctor before? Since it has been there for a long time you should also consider visiting a doctor if you have not seen one.
There are many digestive conditions that can give rise to gastro problems. For example, gastro-esophageal reflux disease (GERD) results in symptoms such as abdominal pain, bloating and burning sensation and is usually treated with antacid and acid suppressants (H2RA or PPI medications). Therefore it is recommended that patients with digestive issue / gastric problems to be assessed and diagnosed correctly before being prescribed 'medicine for gastric problems'.
Gallstones and 'gastric acid' conditions may co-exist, i.e both may be present in the same patient. Gastro-esophageal reflux disease (GERD), or sometimes known as 'gastric acid' to a layperson, typically presents as a burning sensation at the stomach, heartburn and acid brash. Pain from gallstones commonly starts at the upper right part of the abdomen radiating to the back and often described as being sharp and 'colicky'.
Diagnosis of gallstone disease can be achieved by ultrasound imaging of the gallbladder. It is advisable to have gallbladder surgery if the pain is recurrent (rather than taking painkillers only) as it may progress to complications such as gallbladder infection and jaundice.
Burping and 'gastric acid' symptoms are most commonly related to a medical condition called dyspepsia and gastro-esophageal reflux disease (GERD). Patients are usually advised to have a combination of lifestyle changes and medical therapy to help with the symptoms. Examples of lifestyle changes include dietary (less spicy, less heavy meal, reduced caffeine), avoidance of smoking, alcohol and keeping ideal body weight. If life-style changes doesn't help much, medications such as antacids, H2RA (e.g. ranitidine) or PPI (e.g. omeprazole) is a reasonable 'add-on' to help achieve symptom control.
In your case, especially with your age (49 years old), I will recommend a full medical evaluation and endoscopy if it hasn't been done before.
SGPT is an enzyme that is found in many organs (such as liver, heart and muscle), hence a raised ALT on blood test may not necessarily mean it is a liver problem. The next step for you would be to obtain a medical consult and determine the cause of the high ALT, only then can a doctor advise on the next management step.
The few symptoms that you have been experiencing are non specific in nature and do not all point to one particular medical diagnosis. For example, shortness of breath may be related to a lung (asthma) or heart (heart failure) condition. Similarly, dizziness may be related to ENT (vestibular condition), neurological (stroke) etc.
Have you seen a doctor already? I recommend a complete history and physical examination by a qualified doctor as your symptoms may not be properly assessed through an online forum alone. Frequently your doctor may also order investigations such as blood tests to further arrive at a diagnosis.
Clopidogrel sometimes may cause stomach discomfort and worsening of existing gastric reflux condition. In this case, gastric medication may be prescribed to help ease the symptom. However, you do experience quite a significant weight loss – in this intentional (from eating less, exercises)? If the weight loss is non intentional, I will recommend a full body check-up to make sure that you do not have a medical cause for the sudden weight loss (such as thyroid problem, stomach problem etc).
Since your USG showed normal liver fat, you do not need to take any medication. In addition to regular exercises, I will recommend a healthy diet as well (more fruits and vegetables, less oily / fatty food).
Common medications for gastric acid reflux include antacid, histamine receptor blocker (such as Ranitidine) and proton pump inhibitor (such as Omeprazole).