Hi again, got a report today. Diagnosis: Hypertrophic Cardiomyopathy.

A few things i dont have a clue on, i'll post here and if someone knows...

Lungs are congested and oedematous.
Remarkable congestion of the liver as evidence by dilation of sinusoids and pooling of blood.
Mild congestion in the spleen.

Hypoxia would have occurred in the terminal stages which is likely to cause a fit.
The main thing was a problem with his heart, thick lining of the left wall.
I hope this wasnt painful for my cat!

thanks for all your replys and kindness!