As well as my recent itchy/sore vagina and clumpy discharge, I've found that in the last week or so, I've been going from needing to pee a little bit to needing to go really bad in a very short time. I'm not usually like this. I was in a bar last night and had to wait in line 10 mins for the bathroom and I really thought I was going to wet myself. It also feels a little strange when I do pee, like a little bit stingy, not outside but inside, as if it were my bladder. I've been tested several times for STDs and infections and the results have all been negative. Not to mention, I haven't seen my boyfriend since August. What could be causing this? Could it perhaps be a UTI or are the symptoms of that different to what I'm experiencing?