This is long and boring but might help somebody.
I suffered constant UTI symptoms and dryness during sex. This went on for months and was debilitating. I tried several estrogen creams. I have Ovestin the only one that got rid of the UTI symptoms. I only use quarter dose every other day and I only put it on the urethra area. I felt better pretty much straight away. When I use more than half a dose I get systemic symptoms (rapid heart rate, hot flushes, sore breasts) but I get no side effects from quarter to half dose. Because it is such a 'tiny smear' there isn't enough to go inside so I just use Yes water based lube during sex (the oil based lube gives me thrush).
I tried Blissel (low dose estrogen gel) to see if I could spread it inside as it's a lower dose so can have a lot more with no systemic effects. BUT the UTI symptoms were back within a fortnight. I switched back to my 'smear' of ovestin on the urethra and I felt good again.
So I know Ovestin works and my gynaecologist and GP said I can keep going with it every other day forever.
However I've recently also received estriol cream (0.01%) which is like a weaker version of Ovestin. I want to try using the equivalent amount but spread inside a little too. My GP is finally being great (after months of being useless with repeated thrush and cystitis medications). She now just puts 'vaginal estrogen cream' on my prescription and I ask for what I want from the pharmacist. Currently I am still experimenting so have three different creams in the cupboard. But at least I know Ovestin works! This was a turning point for me (and my GP).
I am just trying to strike the perfect balance between solution and side effects. Getting there!
I never got any stinging. Ovestin has only ever made me feel better down below. Hope my journey helps somebody.
Finally the best thing I did was see a sexual health doctor (referred by GP on nhs to rule out STIs). I had a thorough checkup, blood tests, swabs, urine tests. All normal. She said she was sure I had vaginal atrophy and wrote a letter of support to my GP and gynaecologist to encourage them to give me the vaginal ESTRIOL creams e.g. ovestin, estriol cream, blissel, imvaggiss. So I've been experimenting ever since. (I found estradiol gave me nausea and the SH consultant explained that estriol gives fewer side effects than estradiol. Super useful!
The blood tests also showed that my estrogen level was non existent (despite having periods every 60 days). So periods aren't a good indicator of need.
Finally finally, I keep using ovestin during periods when bleeding. I pop it on each morning after a shower every other day even when bleeding heavily!