Advice on effects of long travel sought.

Thank you all for your kind and helpful comments.
To answer the various questions: it cannot have been from something he ate, and we were careful to keep drinking water throughout the day. I didn't ring 111 because we were not in Britain. He is feeling much better now, but I was alarmed by the incident and was just wondering what one can consider as normal in the circumstances, and what not. We have both noticed significant body/health changes as we have entered our sixties. It's uncharted territory; what we used to think was normal, no longer is.
I will certainly encourage my husband to go to the doctor to get checked out.
Thank you again for all your input.

How is he now OP?

Why did it not occur to you to ring 111? It has been around for 20 years plus. I have found it invaluable so many times. Either way, your DH should see a doctor.

The journey made sounds hyper-exhausting and it is possible this is just age catching up with him, but better safe than sorry. Get him to have a check-up.

Doesn't sound normal travel fatigue at all

Like NotaGran, I thought a heart attack. Something similar happened to a friend though they hadn’t done a long travelling day. As they suspected something he’d eaten, there was a lengthy delay in eventually getting medical help.
He should get checked out.

A call to 111 would have been the best thing to do, but I can appreciate that your DH may have said no don't fuss...which is what my DH says, but I no longer listen to him.
The journey sounds long and stressful in this heat and maybe the drive at the end was too much for him after a long day. Possibly something he ate on one or other of the flights? Dehydration? Overheating?
It would be a good idea to get him to run it past his GP.

The thought of your journey made me feel quite ill and I was only reading it not doing it

Only a GP can diagnose an underlying problem

Dehydration can be very debilitating. Were you both eating and drinking enough during your journey? I suffer with migraines so I always have to make sure I have a drink and snack with me just in case.

Why didn’t you call 111 for help at the time. A paramedic would have been dispatched to check him out.
My dad was 59 when he collapsed on the bathroom floor with his first undiagnosed heart attack.

Make an appointment with the GP, even if he is feeling better now.

I agree with Lathyrus and see your GP as the collapsing is a bit extreme. The vomiting could be a virus or eating something dodgy. But I'm also thinking blood sugar levels with the collapsing and weakness. So probably best to get checked out.

Were you able to take his pulse or blood pressure?
We keep a blood pressure monitor at home and DH wears his Apple Watch at night to monitor his health, after a couple of friends had funny turns at night. Might be worth considering a smart watch, purely as a precaution.I hope he’s fully recovered now.

Personally I would be referring this to a doctor.

That’s just my opinion though.

It sounds to be more than tiredness. I am in my eighties and until recently I used to do long-haul flights to Penang in Malaysia. Around 14 hours, then there was the cab ride to the airport and again in the resort itself. We were very tired, yes, but no more. My wife and I never vomited or collapsed and we did this every year for ages. I think he should be checked out by a doctor, although at first description it sounds like some sort of allergy or maybe food intolerance? I assume you ate the same meals on the journey?

I’ve been sick or had a migraine after a long journey, especially if food has been irregular or not to my taste or I’ve been dehydrated, so I think it could happen. However, I’ve never been collapsed on a floor. Does your Dh have a temperature or other signs of illness? If he’s feeling better, that’s obviously good, maybe make sure he has some rehydrate solution as well.