Hi Sir/Madam, I have been experiencing constipation and acid-related issues for a long time. Constipation tends to result in excessive stomach acid and frequent belching. I m also suffering from sinusitis, which causes heaviness in my head. I frequently need to expel the acid in the form of mucus, and I would like to undergo some tests to determine the underlying cause and explore further treatment options. Could you please suggest tests that can effectively identify the root cause of these problems? I would greatly appreciate it. Thank you