You're not alone. Lots of people share your experience. In some cases, like mine, the easy diagnosis is to say 'age' and walk away, but I reckon it is more to do with an entire lifestyle or set of circumstances and is a symptom of some deeper psychological malaise. The thing we have in common is being 'trapped' in a situation that is physically exhausting with little or no stimulation beyond the occasional adrenalin rush. Surely the answer is to change lifestyle. "A change is as good as a rest" is a cliche, but there's a lot of truth in it. In my case (long term care of an aged parent) it isn't an option, but you can do it. Have you looked into moving abroad - or even in the UK? The grass in the next field might not be greener, but at least it's different. You have a great set of skills and are probably eligible for access to places like Canada, Australia and suchlike. At least look into it - that in itself might give you a boost. Oh - and I spent thirty odd years of my life in the computer business - right back to when when it was interesting. They kill your brain. They are evil. Find another interest ;^)