For your chronic acidity and indigestion, generic proton pump inhibitors like omeprazole or H2 blockers like famotidine can effectively reduce stomach acid. To relieve constipation, bulk-forming laxatives like psyllium husk or osmotic laxatives like polyethylene glycol are helpful. Alternatively, magnesium hydroxide can serve a dual purpose as both an antacid and a gentle laxative. Since these symptoms have persisted for several months, I highly recommend consulting a healthcare professional for a proper evaluation to address the root cause, rather than relying solely on over-the-counter remedies. Also, try to increase your daily water and dietary fiber intake gradually.