7 years ago this month I had what I thought was food poisoning.
I have never been so I'll. DH kept calling the GP. They came out, said it was food poisoning (I had up controllable d and v) and took a temp of around 40 but as I could talk lucidly said it would stop. By day four I couldn't move and eventually a paramedic came out, took one look and had me blue lighted to hospital.
I spent 12 hours in a medical ward while they took blood, pondered the insanely high temp and had several conversations with me. Then they sent for a surgical consult. She took one look, whipped me up to her ward, put me on morphine (thank god, five days now and no pain relief). I had a scan, found lots of fluid and they decided it was my appendix. Everything's hazy but the professor came to my bed and told them to get me to surgery immediately and not wait for the theatre slot they had lined up for me as I wasn't likely to make it.
I expected to wake up with no appendix and feeling better but I woke up in HDU after five hours of surgery, with a main line in my neck, an arterial line, nasal tubes, oxygen etc. the appendix had been fine; they drained several litres of fluid but couldn't find a source of infection so they'd put me on whatever high duty antibiotics they could.
Eventually the lab came back that I had blood borne pneumonia. It had caused peritonitis and septicemia and it was only the sharpness of the paramedic, the surgical consult and the professor that had realised how I'll I was. I was in hospital for a few weeks, it took a long time to be totally over it and I didn't actually realise how I'll I had been for a very long time.
But I am here, I am healthy andi have no long term effects. The key was when they eventually found the root problem and gave me the right treatment. I am sure they will be working away trying to do that for your husband as well. Please try not to be too stressed, as stupid as that sounds.