Was very sorry to hear that news also. It was like Robin Williams, it seemed to come out of the blue.
I will admit I came closest to this myself, a long time ago, when I first moved out of the family home I had with wife and daughter back then, after 13 years of living together, forced through no choice of my own, it had been my pride and joy to be achieving everything I thought needed to be achieved, how could anyone complain about being in a nicely appointed detached house with beautiful wife, at the top of my trade as a Chartered Engineer, and with child, sports car, and with more houses in other places including abroad, rented out, I thought we were doing really well. But somebody disagreed, and that became a rock we would not get around.
I was mid forties then, and had all of the problems you outlined above but didn't think anything of it, I thought it was normal, all middle aged men had the same, I thought, because the physical activity of all descriptions had wound down to almost nothing (At least for me! ), my body had more or less gone sedentary. All I did was drive to work every day, work crazy hours, drive home again and sleep, if not driving back to a hotel to sleep, when working further from home, which was often. Nearly everyone I worked with did the same.
Anyhow, after the split, about 2 weeks later, I was lucky enough to meet someone "crazy" from a country (In South America) with a totally different attitude to what we have in UK about, well, everything. She knew fine well my body could be more or less instantly revived, to become the fire she wanted. She knew how to light that fire. I didn't know porn was not just in movies, I kid you not. Our highest score in a 24 hour period was 36:6. I will let you work out what I mean by that :) Since then I've never had trouble.
Anyhow, we stayed together for a while (5 years), but eventually I had to cut loose, it was too extreme for me, unsustainable, it came with extreme emotions (And lack of sleep!). I've had one or two other partners since, but actually am happy on my own. I never get lonely now, always too busy, studying all the things culturally to do with energy because I love it, now I love Afro-Latin music, love dancing to it, doing some of the traditional rhumba moves, even solo, and my body has demands I never had before, but its exercises I can always do myself, no partner needed, though I never rule anything out.
I have different problems now, some I've written in Medium about, both physical to do with my eyes, and mental, to do with, who knows. There are two ways of looking at it, from the pov of what was, and what is to come, and to me it looks fine from the pov of what is to come, but for the folk tasked to look after me, it looks like I've gone crazy, because I've more or less lost the ability to manage life, the way it was. But I am confident for what comes next, I will hit the ground running, even at sixty+ :)
The secret is to get busy living, or stay busy dying, imho, Adebayo.
I don't know if you are single or married. If I were you, I'd do something crazy. Shake up your life, meet somebody crazy you would never dream of meeting, from a completely different, preferably tribal, physical culture. If you are married, take the wife!
Be with those different folk for a while, if not for life, learn to think a little like they think, speak their language, learn their dances, their music, their culture, and see where it takes you.