Burning in the Heart; Can a relationship cause a heart problems?

Hi everyone,

I have a very sensitive story.
Since 3 years, I am in a relationship with a woman. When we met, she told me that she is divorced and I was fine with it. But with time, her past life with her Ex, and her child started to affect our relationship. After a year, I decided to breakup. But she went into depression, and she was about to make a suicide.. so I came back to her... and last summer, I couldn't bear it anymore... phone calls in the middle of the night.. fighting with her ex over the child... crying for hours for not seeing her son... etc

Since 3 month, I decided to move and live alone.. so now I have my own place.. and we still in a relationship, I see her one day a week (saturday night).. But the problem is... since some time, when I decided to move and live alone.. everytime, she calls me and want to talk, I am having this HEART weird feeling... like BURNING... actually, at this moment, writing this email.. I feel it... I was ok... but she just came on skype, and started talking to me... i was fine... and suddenly the "Burning" feeling came...

I just want to know... is this feeling of buring in my heart has to do with her? or it's something else... Shall I disconnect for good with her...
I am confused... I don't want to end up with a heart desease... I am very a fit man, sportive... I've never had problems with my heart before.. I am 36 years old.. and none of my family had a heart problem.

I appreciate any help or if someone can share with me his experience if similar to get out of this situation

Thanks