Hey again. Spoke to the vets. My cat had a heart problem..

Hypertrophic Cardiomyopathy / Congenital heart disease defect (im still waiting to collect the report)

I think is what they called it. He was born with it, Like a ticking time bomb :/ As my other cat was its brother i have to take him to the vets so they can run tests and scans on him. If he does have it too, then it can be treated but cannot be cured.

this sucks :<