I had severe vertigo attack,is it due to cervical while i have first degree heart block as well. it lasted for ten minutes which made me to sit down.

Vertigo: Given your age and extensive medical history, it is very likely light headedness versus vertigo and more likely due to vascular insufficiency or medication. I strongly recommend evaluation by your doctor and referral to neurology or ENT if orthostatsis and physiologic etiology are excluded. are

Heart v. Brain/Spine: (Not knowing your other medical conditions...) In someone like you with known first degree heart block, the likelihood of your dizziness being heart-related is higher than it being brain/spine-related. Keep a log of the timing/duration/symptoms of these dizzy spells and take it to your physician. http://www.nlm.nih.gov/medlineplus/dizzinessandvertigo.html