@Arafat,
as long as u have documents that can prove what u have been doing since ur last period of study,u r good to go. I graduated in 2004 after my National Diploma in Business. After which I underwent a year industrial training at my father's company. later,I started my own business in May,2008 to date and I applied in 2011. I have 7years study gap and I got my call for medical test on 13th July.
So, no shakings. U shall get there(Insha Allah)