It's hard but you have to find things to do, so that the healing can take place.
As they say, "Time heals all wounds," - but it's what you do with that time that counts.
Write an r/UnsentLetters
If the weather allows, go for walks or run
Try to volunteer or help others. I have found if you do something for others, it helps a lot with taking your mind off things.
Be kind to yourself.
Btw, there is such a thing as broken heart syndrome. It's called takotsubo cardiomyopathy Basically stress as severe as losing a lifelong partner affects the structure, and therefore the ability, of the heart.
Takot subu are octopus traps that resemble the pot-like shape of the stricken heart — and that's not all that's unusual about broken-heart syndrome. It occurs almost exclusively in women.
Takotsubo cardiomyopathy is a weakening of the left ventricle, the heart's main pumping chamber, usually as the result of severe emotional or physical stress, such as a sudden illness, the loss of a loved one, a serious accident, or a natural disaster such as an earthquake.