Hi Andrewj. Welcome to the forum.

Please understand that we're not doctors, just a group of patients, and even if we were then we couldn't make a diagnosis over the internet.

Still, even though I'm not a doctor, I can maybe make a couple of observations made from my own experience.

- You've had a battery of tests, all of which have come back negative and show no trace of cancer.  This is good news, of course, but it doesn't help resolve your pain.

- I've suffered from IBS for over 40 years, and in my personal experience, anti-spasmodics for IBS are pretty useless.  They did very little to stop my IBS symptoms.  I also found that adding extra fibre controlled by IBS for a while, but not for long.

So that's the bad news.  However, I did get relief when I was referred to a dietician who put me on the FODMAP protocol (which you can Google).  This was hard work but eventually found that my symptoms are triggered by mushrooms (which I love), beans (ditto) and more then a few tablespoons of milk.  This meant that my favourite breakfast of a bacon roll with mushrooms and a latte coffee was daily feeding my body with exactly the right combination of triggers.  I've now cut these from my diet, replaced milk by almond and soya substitutes (which I really like) and I'm a lot better.  Not perfect, but a lot better.

Now, these are my personal triggers, so there's no point you cutting them out, but it's just possible that you're eating something every day which is triggering your symptoms.

I suggest you go back to your GP and ask if you can be referred to a dietician.  If the dietician thinks that the FODMAP protocol might help you, then they'll give you the assistance you need.  The protocol is really complicated and the first few months are really difficult, so I don't recommend putting yourself on it without some sort of support.