Since Novemaber I Kept Getting Symptoms Of A Urinary Tract

Since Novemaber I kept getting symptoms of a urinary tract infection. At first my test was negative but than I was diagnosed with a UTI. I was put on Bactrin but that made my stomach upset so I was switched to a different antibiotic. I had a cystoscopy done , a CT scan, and an ultrasound. Everything came back as good and didn't indicate any other problems. Soon after I got another UTI. The doctor kept diagnosing me with UTI's since November. However, my last UTI was for weeks ago. ( February 22nd). It was with the bacteria Proteus Mirabilis . After I was done the antibiotic I still had small symptoms of a UTI but not as bad. I had some kind of batter days for two days after I finished the antibiotic. Which where a Thursday and a Friday. Than on Saturday I started to feel a little bit worse again. Monday it was horrible. I have no burning no pain but just the frequency and urgency intensified. By Thursday morning I was feeling very uncomfortable and that is when I found out that my Monday urine indicated that I h ave E.Coli but a small count. Again im on antibiotic called Levoflaxin that this bacteria is sensitive to. However, I'm on day 4 and I haven't felt much relief ( like with the previous antibiotics; which makes me wonder if it's also another condition either an overactive bladder or IC). But in-between my UTI's I still have symptoms of urgency and frequency that don't fully go away. I feel like I never fully empty my bladder although seems to be untrue because nothing was show on an ultrasound where after I emptied my bladder the doctor said that I fully emptied it. I can't concentrate on anything since November, I work and go to school. It causes me to not be able to concentrate on studying where the only thing I think about is having to go to the bathroom. I'm in a relationship for 5 years but since my condition I haven't been having sex. That's why I'm really confused on why I keep getting UTI's. I have been wondering what it is , if it's a horrible case of chronic UTI's, overactive bladder or maybe IC. My frequency and urgency does become worse when I am on my menstruation. But again... I don't have any pain its just the urgency ever since November. I don't know what to do anymore, I'm scared to go out anywhere, it's impacting my relationship, friendships, school and work life. I desperatly need advice and I don't know what to do anymore.