Hi Lucy, sorry to hear of the trouble you are having. I am going through the same thing right now, with swollen glands painful glands in my armpit and groin for almost a year. I've been back and forth to the doctor and FINALLY they did an ultrasound and found that I had at least one gland in my groin that was over 3.5 cm. My primary care sent me to a surgeon for a consult and possible biopsy. My consult is friday and I'm counting the minutes. I just want to get everything over with and just know something, no matter good or bad, so I can start planning treatment and healing
If you can't get any results from your primary care doc, try looking up surgeons in your area that deal with the lymphatic system and just make yourself an appointment. A surgeon by nature will probably be more aggressive in their approach to diagnose, by immediately ordering a scan of some kind and are much more likely to biopsy if they find anything on the scan.
From everything I'm reading, if it is lymphoma, the only real way to get a definitive answer on type, is either a biopsy or lumpectomy anyway.
Best of luck to you.