I have had all the symptoms you mentioned simultaneously. I have a mitral valve prolapse and a partial right bundle branch block, but that is not considered to be serious. I am certain Lyme or mycoplasma caused my heart symptoms.
I was diagnosed with asthma because no one was testing for mycoplasma at the time, but my asthma symptoms are essentially limited to shortness of breath and an inability to detoxify pollutants like aldehydes, chemicals, and cigarette smoke.
My costochondritis is due to improper mineralization (food absorption issues) and having lead in my bones. The lead seems to like to store in the ribs and makes them a bit brittle.
I have brain fog, too.