Yes last time, Yes again (assuming the question is the same!)
Re the EU, no, there is no guarantee we'll still be members/be able to rejoin but in contrast to pp the noises I'm hearing are very positive. The Spanish said just at the weekend (and not for the first time) that they have no objections to us being EU members, as the Catalonia situation is constitutionally quite different from ours. As we would remain net contributors and are fully EU compliant already, there's no reason for France or anyone else to object, and if Theresa carries on with her threats to undercut the EU and become a tax haven of sorts, I can see there would be a certain degree of joy for the EU to welcome us out of spite!
We cannot join the Euro, we do not meet the conditions - most importantly, that our own currency (which we don't have) must be in the ERM for at least two years without problems. (There is no requirement to even join the ERM as EU members, btw.) We will have to agree to do so at some point, but that point may be far off in the future or never arrive. There are precedents for this... We could, of course, use the Euro, or any other tradeable currency - £, $, ¥, and there my iPad runs out of symbols. 
Re oil, prices are actually starting to recover and new fields to the north and north west are starting to be opened, but I think renewables are the future. We are lucky to have access to massive wind and, more particularly, wave power, and without WM cutting investments we can properly develop these sectors.
As for the argument that we'd be ruled by Germany instead of WM, that doesn't really stand up. We've just seen every amendment to the Scotland Bill proposed by Scottish MPs kicked back, and every proposal to give us a differentiated Brexit ignored. The Supreme Court ruled recently that Sewell is a convention and not legally-binding, WM could close Holyrood without even a vote. We have no meaningful voice in WM, and EVEL reduces it even further.
The EU don't force us to have WMD in our back garden, 30 miles from our biggest population centre. EU don't take us into illegal wars. EU isn't cutting benefits to our most vulnerable citizens - we could set our own rates. EU don't take all our money and give us some back, and would even let us have a say in how much we contribute to the EU budgets. EU don't impose laws on us, as EU members, we'd have the same veto as any other member country.
We don't have to ask the EU's permission to leave...