Glenda Sexauer, 59, was diagnosed withheart failurewhen she was 46.

But it took nearly a yearall while her heart health was steadily decliningfor doctors to realize what was wrong.

She had several symptoms, including relentless fatigue, bloating, nausea, and weight gain she couldnt explain.

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Initially, she was diagnosed with an autoimmune condition and pneumonia before her doctor referred her to a cardiologist.

She was hospitalized for several weeks and had a pacemaker and defibrillator placed in her chest.

Heres her story, as told to writer Erica Sweeney.

Ive always been active.

I exercised regularly, ran marathons, and once did a 2-day, 150-mile bike ride.

But, when I was 46, I noticed that I wasnt feeling like myself anymore.

I hadgained some weightand wastired all the time.

I slept a lot and felt bloated.

I just knew something wasnt right.

Then I researched my symptoms online and thought it might be my thyroid acting up.

I thought, OK, thats what it is.

I continued feeling tired all the time, though, despite taking medication for Hashimotos.

I had a lot going on in my life then too.

My son had just gone away to college and my mother-in-law was living with us.

I was working as a vice president of a financial services company.

My mom was also really sick; she had Alzheimers and was nearing the final phase of her life.

So I thought maybe I was just experiencinganxiety.

Then I started feeling afunny sensation in my chestwhen lying down.

It was kind of like I could hear my heart gurgle.

A couple of nights I had to sit up to sleep.

After my mother passed away, something else gave me pause.

I was at her funeral when I coughed up some stuff that didnt look right.

I saw my primary care doctor and told him I thought I had pneumonia.

He confirmed I had a little bit of fluid in my lungs and prescribed medication.

No one ever thought I hadheart disease.

Then, I finally got a heart failure diagnosis.

To celebrate our 25th wedding anniversary, my husband and I planned a trip to Hawaii.

We decided to go, even though I wasnt feeling great.

I couldnt eat much and felt nauseated.

When we got there, I sleptsomuch.

I had to sit and rest after walking up just two steps.

At the time, we laughed because I was really pretty healthy.

I decided to see my doctor again to run through all of my symptoms one more time.

I hadnt, so I was sent to a cardiologist.

Thats when I learned I had heart failureand I was floored.

I remember calling my sister and crying.

The day I was supposed to be released, I went intocardiac arrest.

I had to stay in the hospital for another couple of weeks in a medically induced coma.

Its pretty much idiopathic, meaning theres reallyno known causeor reason for my condition.

I ended up getting a comboimplantable cardioverter defibrillator(ICD) thats a pacemaker and a defibrillator.

Its taken years to feel like myself again.

Once I got out of the hospital, I had a lot of doctor appointments.

I was unable to work for about three months.

I would get very lightheaded.

I was exhausted when I got home and would go to bed really early.

It took years to feel like myself again.

I still have an ICD, and I take seven different medications regularly.

Overall, I know Im lucky because Im pretty active.

Ive recovered a lot better than many of my doctors expected.

I can now do a boot-camp-style workout four days a week.

I hike one day a week and also do yoga consistently.

Im retired now and babysit my 15-month-old twin grandbabies two days a week.

Now, I enjoy sharing my story to help other people.

My diagnosis was certainly delayed.

But they didnt ask a lot of questions either.

We were always focusing on a specific symptom.

Unfortunately, it took almost dying to get diagnosed with heart failure.

Ourheart-related symptomscan look a lot different too.

I can use what Ive learned and whats happened to me to help someone elsemaybe even save their life.