Why wouldn't your GP even order an ultrasound? If you're experiencing jaundice, and are otherwise healthy, gallstones are the most likely culprit and can be detected via a simple ultrasound in most cases.
Because my GP is... not cut out for his job, to put it nicely. I need to change, but it's irrelevant right now as I've circumvented him.
I thought his approach was weird and off, and must have been something I'd bought about:
Him: "tell me word by word what you want me to put in your notes"
Me: "uh, what? I don't care. I just want you to at least have a crack at figuring out what's wrong with me."
Him: "'Abdominal pain.', then."
until I learned that he says the same to practically everybody he "treats".
I asked for an ultrasound, as I had suspected gallstones about 18 months into the ongoing nightmare - he said, and I quote: "You're not fat. You're not female. You're not forty. You don't have gallstones. You have hypochondria. I'm not wasting the time it'd take to request one."
I get that he sees dozens or more patients per day, and that it's got to be an incredibly trying job, like tech support but worse, but if you can't take the heat... get out of the kitchen, before you inadvertently kill someone, and go be a lecturer or something.
If they're in the UK I implore you to complain about the lapses of care. Look at it this way, it isn't up to you to parse judgement over if the care you received was fitting or not, but it gives people who are qualified to do so a heads up so they can examine it.
The NHS has a lot of very good GPs. This clown is giving the service a bad name and worse still giving people a sub-standard quality of care. Please complain to the health authority.
I've had a similar (albeit much less serious) situation with a GP. Went to one and he put me on some pills. The next day I was in so much pain I went to another who sent me to hospital and he and every doctor I saw for the next couple of days was shocked the first GP hadn't sent me as a precaution as that should be SOP. I've had to see the first GP a few times (just for basic things because other GP's were busy) since then and every time I've regretted it. Change GP asap.