Heart problems after birth?

Mommas, anyone feel like their heart health has changed after pregnancy/birth?

I’m about 10 months PP, and since probably the last 5 months my heart/chest will feel so heavy. I randomly get a high resting heart rate of like 120-139ish from not doing anything. Sometimes I have to catch my breath from a sentence. Yet all my tests and imaging shows everything is okay? But, I know my heart just feels different. If that makes sense. All of this is really random and I can’t correlate it with anything specific. I know I can’t be the only one. Let me know if you experience anything similar.