So sorry you've been going through this.
Im sorry to hear about your pain. It sounds very similar to me when I had horrendous groin and low back pain. They originally put it down to a ruptured ovarian cyst but when that didn't heal my GP sent me for an ultrasound and they did my whole tummy. It was then they noticed my groin nodes were increased and also my spleen had shadowy areas. I was then referred to the lymphoma team who did my blood tests and a CT scan. My bloods came back fine but the CT showed my lymph nodes were raised all over so they did more investigations. Took them a while but they did a lymph node biopsy and it was only then that they diagnosed me with lymphoma, until that point theu weren't sure if it was.
So sorry you've been having these issues but please continue to see advice until the cause of your pains can be determined.
In answer to your questions ;
How long have people waited for an ultrasound? And how soon after would they do a biopsy?
For me I had my ultrasound, then got referred, then had a CT scan and a PET scan and then a bone marrow biopsy before they did a lymph node biopsy. So for me it was about 3 months. I've been told this isn't usually the norm in terms of length, but they usually will do atleast a CT scan after the ultrasound. Every medical team is different though and I have heard for other illnesses that they do the biopsy there and then with the ultrasound.
Can lymphoma still be an option of blood work is fine?
It won't be the answer you want to hear but yes, in my case and the case of a few others I've spoken to our bloodwork indicated nothing about the lymphoma.
Can lymphnodes just swell for no reason?
Not usually no reason. But there's a whole host of other reasons why they would swell up including infections and viruses. When I was referred to the lymphoma team at first they tested me for all sorts, including blood disorders, STDs, issues with kidneys and glandular fever. Apparently if you've been exposed to glandular fever even once in your life it'll always show up on your bloodwork . Essentially there's a whole host of other reasons which they want to rule out.
My advice to you is keep persisting. I know it feels like a losing battle at times but until you know the root cause of why this is happening you're going to be going out your mind with worry and no knowing. It's every possibility it isn't cancer but regardless, if you know Something is up then don't let them dismiss you. I knew for a fact I wasn't well so pushed and pushed. Probably drove them mad but I can guarantee the docs who saw me at the start would be so surprised at my diagnosis of stage 3 lymphoma. Some shrugged me off just because of my age yet I've seen people younger than me with it so that just seems silly.
Wishing you all the best feel free to ask anything anytime