Hi Bryaner,
Sorry you're here but as you've found, it can be a useful place for great info, advice and perspective!
I was 48 when I had LDR Brachy nearly 2 years ago, also 3+4 and a very similar PSA.
Please don't worry about the procedure, I found it quite noticeably less traumatic than a biopsy and recovery from it very similar/easy.
I was immediately capable of normal life, Alfusozin prescription dealt with the immediate feeling of minor urinary urgency for the first few months (provided you remember to take it) but if anything like me, by 6 months, you won't notice any difference pre and post procedure.
ED has also been a non issue. My consultant has prescribed me the lowest possible dose of Tadalafil every couple of days and whilst I could go without, I take it from time to time as it unsurprisingly rolls back the clock and who wouldn't want to feel like a teenager again 😀
Dry orgasms take a bit of getting used and the initial sensation isn't as pleasurable as normal for maybe a year but I think that is once again down to the initial radiation battering and inflammation of your prostate. It's not at all bad but months further down the line, you'll come to realise everything becomes a lot more normal again sensation wise!
Be prepared for a bit more lethargy than usual, again for the first 6+ months. Nothing that will stop you in your tracks but I found the temptation to sneak off for a mid afternoon 30minute snooze when I could quite appealing!
Finally, hopefully you will be like the majority of men whose PSA just falls in a straight line after the procedure but be aware and prepared for a fairly unexplainable phenomenon called 'PSA Bounce' which is much more common in young men and can actually result in higher short term PSA levels for a year or more - that can be quite mentally draining if you allow it - you can find some more info on it in some of my other posts on here.
That may all sound quite a lot to consider but it's really not - if you have half the experience I have, I'm sure you'll find it a walk in the park.
Good luck!