Urinary Track Infection and Sex? Help.?

Okay, so. I've had a UTI for close to two weeks now. The most it's done is give me strongly scented urine and a little bit of an itch. My boyfriend visited me this past weekend, and we had sex a few times. I read that if you have sex with a UTI, it might make the sex uncomfortable. It didn't for me. But anyway, in my household, I guess we ate some rancid cheese burgers? Because everyone was complaining of stomach aches, and my little brother even threw up. Nevertheless, I felt fine though. When my boyfriend left to go home, that's when I started feeling queasy myself, not enough to vomit but the feeling was still there. Last night I was running a high fever with severe muscle aches. I was light headed. But I never threw up. Actually my stomach ache subsided the hotter my fever got. I took some medicine and went to bed early. Today I feel like I got hit by a bus. I'm worried that having sex with my boyfriend with a UTI has made me sick like this, but then again it could of just been the cheeseburgers? I'm not sure. Any ideas?