It is probably the vaginal atrophy stinging - VA mimics urine infection-type symptoms really really well. If the vulva area is dry and the skin thinning due to loss of oestrogen, then initial applications of appropriate treatment may well sting. Was it a single application if it's 5 days ago? 4 me it was like razor blades 
up there !
One should never be prescribed ABs without a urine test being sent to a lab for growing. GPs still don't get it 
Try not to panic. The body is very tender down there anyway, the vulva area needs TLC ;-). I occasionally use KY Jelly on the outer area when very dry and Ovestin internally regularly. I also put a little of the latter on the labia on the nights that I put the 'ovestin' in.
U haven't 'done anything to yourself' other than try an appropriate VA treatment. Perhaps try 'yes' or 'sylc' moistorsor ? An perhaps don't insert the 'ovestin' as deeply into the vagina for the first couple of nights.
The body is full of bacteria, most of it good.
It's a full-blown UTI, the same thing happened last December when I used Ovestin. I can feel quite unwell with UTI's, and defo felt it with this one. Because I can get VA symptoms at the drop of a hat, sometimes I can be quite liberal with the Ovestin application and just.. smother everything down there in it. I think I did encourage bacteria into the urethral area when I used it a few days ago, by just moving the cream around all over and moving it around too much, including directly over the urethra. I really wasn't thinking - it had been a really hot day, I'd been sweating like crazy, and I should have showered beforehand. I have a gut feeling if I'd done that, I wouldn't be sat here with a very upset bladder. When I applied the ovestin, it didn't really sting at all - but then I have (or thought I had!) the VA piece somewhat under control.
But that said, there is definitely an atrophy problem still going on - or rather should I say, a problem with finding a regime for me that keeps it completely at bay. I recently bumped up my systemic estrogen quite considerably - from 75 to 125, and within about 48 hours some of the remaining stubborn irritated-tissue type symptoms I'd been having had completely gone. But, then it somewhat came back, and it's always in the same areas - right around the urethra, and the vestibule.
And despite me being on 125 systemic estrogen, now using vagifem regularly - if I miss any external tissue with the ovestin, it's insane - literally one small section can feel like it's burning to touch, but right next to it is plump, healthy tissue that doesn't hurt at all. For me, the area immediately around the urethra is painful to the touch, as is the vestibule area in very specific spots (sort of the ones that you mightn't realise need covering with ovestin, like.. really get in there
) All that said, looking back on it - I had a transvaginal scan done recently, and s***, the gel they use burned the bejaysus out of the bits of me that aren't under control VA wise. Yeoowww!
Because my bladder has had a hard time, and I'm in Ireland.. I didn't want to wait for a culture to come back that would take rather a long time - I chose to take the ABX. Otherwise it's too much of a risk for me to leave it sit for a few days, I can become really quite unwell.
Anyway I'm lying here, rather in a pit of despair TBH. I can't even tell what is burning - I think it's my urethra, and lower bladder. I'm afraid to even put any ovestin anywhere near me now. I'm wondering if I mixed it in with just a little EmuAid to act as an antibacterial.. but then that might affect absorption.
At this point I feel like I have so many health issues, that it's really affecting quality of life. I just had a huge diagnosis of something else that I was trying to get my head around, and I literally don't have the energy for this. Am feeling very overwhelmed
