I don't support leaving the EU (even though my profile picture is nigel farage) but honestly, I don't belive the UK will go to shit. Yes, the pound is currently fucked but in a month or so expect that to return to normal. The UK will still remain within the EU for 2 more years (while negotiations are sorted), so most trade deals with other countries will be sorted by that time. The UK will continue to trade with other countries all around the world, just like it did when it was in the EU, as the UK is a major importer. Honestly, the EU will be more effected by us leaving than we will in the long-term. The UK is the financial hub of the EU and also the only country (along with france) that has a powerful military. I have a feeling what happened in the UK will happen to other EU countries and the EU will begin to crumble. Additionally, don't worry about big corporations HQ's moving the the eu. The euro is unstable as shit. They'll probably just stay here.
Additionally, if we stayed in the EU we would be forced to adopt the euro by 2020, the euro is NOT a stable currency, and it would effect our economic growth.The UK's economy growing really fucking fast at the moment. So we may well have a brighter future for the UK.