TBH, if I was you, I would be more worried about the TTIP EU/US deal and the loss of the NHS in it's present form, than the Leave vote. You have automatically got PR in the UK and you work, you also have experience of US companies and a health service. Cameron is said to be in favour of the TTIP for the EU and therefore he won't veto it. Have a search on google, have a read and judge for yourself.
I agree the main concern for me is the forgone conclusion that TTIP will be signed. It has so many things within it that will harm the European economy, protection of health and the environment. If you have any doubts look into NAFTA (North Atlantic Free Trade Agreement) to see what our future will be. The main section is ISDS clause which in NAFTA is Chapter 11. I did a mini dissertation on TTIP and the impact of it within the labour law. I should make it clear that TTIP will not affect labour law as much as say health, the environment and the economy and I only focused on the ISDS clause. Within NAFTA Chapter 11 Mexico has lost at lest two million jobs whilst the USA has lost over a million since the inception of NAFTA. I could not find any facts for Canada. But Canada has paid close to a billion in fines for legislation it has passed to protect the environment and peoples of Canada against unscrupulous companies and harmful business practices. For my paper I used five cases. Out of four of the cases against Canada they paid £164,920,000 whilst one case is still pending because Canada will not repeal and environmental law which the tribunal has agreed against. It is respect of protecting the environment and until Canada repeals the legislation the fine is accumulating. Within the EU there are two key cases from the CJEU which outlines the decline of labour law which protects the working class. The two cases are Viking and Level. Because of these two cases a number of conventions cannot be now exercised. We cannot claim national security so we must follow these rulings within UK courts as they are binding. Whilst French firm Veolia is suing Egypt because they dared to implement a minimum wage to protect their citizens from being taken advantage of. This is causing a race to the bottom of all nations to protect profit for the few (one percenters).
Under and ISDS clause that the UK is part of Eurotunnel company has successfully filed a claim against the UK twice due to the issues around the immigration crisis and the inability of the UK and France to protect their business interests. The first fine we paid six million and the second fine there is no actual figure of the fine that I came across but both the UK and France lost the tribunal hearing and both have to pay. These costs to the government, which by the way you and I pay via taxes, do not include the costs we inure whilst researching and defending cases. Thus if we do become part of TTIP we will see claims against the UK rise to about the same level that Canada currently has.
There are a number of other concerns within the EU but this is my key one and no one, as far as I am aware, have really discussed it in the debates. But I have not seen everything.