Choking not caused by food/liquid, violent coughing attack, thick mucus, eyes turn red, weight loss, chest pain; my dr cant find out whats wrong?

Aspiration: Even small quantities of fluid or food can cause the airway to become inflamed, infected or reactive. If you are still symptomatic I would suggest a Pulmonary evaluation, including PFTs and a Chest radiograph. Weight loss may or may not be related. Other possible causes that can contribute include allergies and reflux. A virtual consultation is available and may be useful to you and your M.D.

Allergic response...: Symptoms consistent with Allergic Response, probably to Environmental Allergens. Weight loss is probably due to not eating enough due to 'Choking' feeling; since one is not inclined to want to eat if they anticipate 'choking'. A Pulmonary consult or Allergist could help identify the cause of the Symptoms.