Concerned about my body, is it a UTI?

This started a couple of days ago but ever since has gotten worse.

Friday I was beginning to experience trouble in terms of urination (pain, inability, colour), fatigue and slight temperature. Saturday it began to get worse so I skulled water throughout the day and attended work where the urination problems decreased. Now Sunday the problems are back worse than ever coupled with period like cramps, right lower back pain, nausea and dizziness.

I am on the pill (have been for 2 months) and my period is due in just under 20 days, I am also sexually active but protection was used.

I originally thought this was an UTI, still do but I have usually been able to avoid getting them from after sex routines of tolieting, staying hydrated and being clean down there.

Has anyone had similar experiences?