UTI/kidney infection

So I was at work today and I suddenly was feeling lightheaded nausea almost vomiting I escaped that somehow and the past few days have had slight back pain and nausea but nothing crazy but today I went to the hospital because I thought I was having a panic attack/kidney stone issue which I do get I had no frequency to pee no typical uti symptoms other then nausea and lightheaded my vitals were fine so I knew it wasn’t a panic attack But about a week prior had some itching and burning in my vaginal area but I used yeast infection cream and I thought I was fine, the hospital told me I had some bacteria in my urine aka a kidney infection/uti but has anyone had something similar where you’re only symptom of a uti seems to be nausea because I have never had a uti that’s been like this before?