Levery time i try and lay down i feel pressure like my head will blow up and when trying to sleep i start feeling like i am having a fit until i situp?

Seek medical care: This Is very unusual and should be evaluated to rule out increased pressure inside skull.

Supine head pressure: There is limited information. Would check your blood pressure, also consider reflux, sinusitis, drainage . Try elevating head of bed and taking 1 zyrtec (cetirizine) 1 hour prior to bed and if that does not work omeprazole 20 mg twice a day .Follow up with a doctor/urgent care