For continuous UTI, you should undergo necessary investigations to rule out any major causes like a kidney stone, etc.
You should get a urine culture done once.
A cystoscopy to rule out bladder related issues and an ultrasound abdomen is needed. Get kidney function tests to know everything is normal.
The pain can be related to UTI, or the infection might have spread to the pelvis, causing PID, or it can due to kidney stone or infection.
Only when the causes are sorted out, treatment becomes easy and straight forward.
When there is no correctable cause, you can try continuous low dose antibiotics or post-coital antibiotic prophylaxis, or a vaginal estrogen creams can be tried. You should talk about what bests suits for you with your gynaecologist. She can suggest you based on the examination findings and Investigation reports.
About stone floating from one side to other, it cannot happen, but pain can radiate from one side to other, I suggest an immediate ultrasound to know the presence of kidney stone.
About lump under the chin, yes I suggest a biopsy, to know what exactly is the cause. You can ask for an exscisional biopsy, where the lump is removed and sent for biopsy. You don't need another surgery if pathology report proves it as benign and continue to have cranberry juice. It is good for UTI.
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Have a speedy recovery.