There were signs of trouble.
Unfortunetly, I received a
bad news a
few days ago. My friend's father had **an infarct! According to my friend, there were signs of trouble ***a long time ago. His father was overweight and feeling
tired frequently. He also often used to fell
felt chest pains. However, he persisted on not lose
ing weight and not seeing
**I would favour heart attack, instead of infarct or infarction, if talking in a layman ways (non-medical people), it´s up to you, tough. Many people will understand just the same, others may or may not ask themselves wich kind of infarction, myocardial/septal/cerebral (brain) infarction... Just for information´s sake.
*** there were signs of problem since (or even FROM) a long time ago... [IMO.]
Nothing wrong or odd with feeling, just to to let you know that felt
also could be used. As for the word order "feeling tired frequently", I would change for "feeling frequently tired'', but then it´s me. Others may disagree.
Let´s keep the eyes peeled for further opinions/views/editing and improvement.