My breath smells like fish and it's only getting worse. i also frequently get tonsillitis.

Halitosis: Bad breath can be coming from a number if different problems, including cavities, gum disease, acid reflux, and your diet. Since all of these potential causes cannot be addressed over the internet, it's best to make appointments with your dentist and physician who can examine you and rule things out, one by one.

Breath odor: have you seen a dentist and had your teeth cleaned recently? If not then start by seeing a dentist. Many breath problems are because of your teeth and gums.. Other causes can include sinus, acid reflux, metabolic disorders, or GI problems. Your primary care doctor would evaluate these concerns.

See dentist: Could be many causes- meds, supplements, mouth breather, diet or dental hygiene- brush, floss and brush tongue. See a dentist and get a thorough cleaning and exam

See a dentist: In the majority of cases, the cause of bad breath, or halitosis, is the product of bacteria in the mouth. The proper diagnosis is the key to a successful treatment. See your dentist for Halimeter test, diagnosis and bad breath treatment that depends on its cause. Good luck.