Hiya Jamie,
As you've probably already guessed, this sounds like 3rd ñana, Knowledge of the Three Characteristics, moving into a strong 4th ñana, A&P Event. Your earlier experience sounds like a 'hard' jhana but I would avoid holding onto the memory of it
too much, acknowledge it and use those memories as signposts, not the experience itself.
All of this has faded now and I am finding it difficult to motivate to sit. there is always some excuse, some valid and others not so valid. I am much more tired all the time and tend to snooze my alarm MUCH more in the morning.
This is Dissolution, 5th ñana.
Just to provide some background, I am in my mid thirties, a father of 2 and I have very little to no free time for meditation or other personal activities. I was trying to find time at the office to sit but that is much more difficult now. My wife knows I sit and certainly supported it when I was showing progress but I seem to have reverted now. It just seems like there is not enough time or energy in the day. I have had a lot more issues (than after I started meditating) with being reactive in the past weeks (arguments, lying to protect myself, being defensive, etc.), after this experience, and I have a vague desire to sit or do something but when I DO get my ass on the cushion I tend to just fall asleep or can't concentrate enough to really make any progress at all. It is rather frustrating.
You'd be surprised by how many people on here have "done it" in very similar conditions to your own; I'm 31, a father of one and can guarantee you that there are many, many ways to make progress without your ass touching the cushion. Formal sittings are essential to progress, no doubt about it, but bringing practice into daily life is surprisingly easy, wonderfully satisfying and very effective in my experience. We can talk more about that another time but, for the moment, let's stick with the difficulties you're having right now.
Dark Night is a fucking nightmare sometimes, but we've all been through it numerous times and you'll find a lot of help on here from people keen to assist others through these stage.
This chapter of MCTB contains some profound and seriously helpful advice which should be read, and re-read until it sinks in as Daniel has written this beautifully moving, sincere, heartfelt piece which provides some incredible insights and potentially life-changing advice. Pay particular attention to the resolution he writes, I don't want to sound like an ass-kisser here but it is the most amazingly powerful part of the entire book and allowed me to skillfully negotiate the darkest of dark nights. If your wife is cool with you meditating and doesn't have a problem with it then it may be useful to let her read this too so that she can see that your possibly asshole-like behaviour is just a side-effect of this process which will pass soon with solid, precise and committed practice. It may even afford you a little more time to go and sit, hopefully she'll understand that this will allow these periods of negativity to pass more quickly which will be beneficial for everyone.
I have read MCTB recently, earlier in my life I dabbled in GD, Thelema and A.'.A.'. stuff where I had some different experiences that were significantly less profound than the ones I have listed here. I have been a seeker from about high school onwards, sometimes wondering why I was doing what I was doing when there was so much else out there to do!
Me too! I was a magick guy for a long time until I found that vipassana is considerably more effective and efficient for making progress along the Path. It's great to be able to practice with having to remember which page in "777" you can find the gematric interpretation of some Greek god-name!

So I appreciate any help in identifying these experiences that I can get from the great community here (I have been lurking for a while). I have my own theories as to what they were but I don't want to share those yet to avoid coloring any responses.
Feel free to state your case if you have an idea of where you are, either way you can get a lot of good advice from a lot of different folks on here. If you're wrong then it's an opportunity to learn so there's nothing be to lost.
Good luck with your practice, and I hope this was of use to you.
T