I think probably you have anoxic convulsion means repeated cough reduced blood circulation to brain and leads to hypoxia and convulsion. You need to do carotid doppler, 2D echocardiography and Eeg to rule out convulsive syncope.
As there is cough and seizure you need mri of brain to rule out CNS tuberculosis.
Next Steps
Mri if brain,EEG,ECHO,Carotid dopplet
Health Tips
Start anti epileptics as suggested by your neurophysician