We managed before.
But we didn't manage before. Where did this weird idea come from? We were begging to join the EEC for years before they let us in. Once we'd lost our empire and spent all the Marshall Aid money on shoring up our 'status' in the world,instead of investing it in the UK, we were declining fast.
Also, you might not have noticed but the world has moved on a great deal since 1973. We can't go back to it.
not every decision we make having to be sanctioned by Belgium.
I despair, I really do despair 
Repeating a falsehood over and over again does not make it true.
We have full sovereignty over all of our domestic law and have chosen to share sovereignty in some areas, such as trade, in which we have a say, have even initiated some policies, and which work mostly to our benefit.
I'd be so pleased to hear some specifics of how the EU (not Belgium, that's a fellow member state) has exerted control over all our decisions...