No sidse I wouldn't as you can develop a resistance to them plus until you get your culture results back you wouldn't know which bacteria you were targeting.I would try drinking some lemon juice in warm water to neutralise any acidity in your urine and try and restore your ph balance.your dmannose is only helpful for ecoli bacteria so that's probably why it's not helping,watch your diet and avoid any acidic foods,check out the bladder diet online.It could be VA you have as this mimics utis so unless you have confirmation from labs it's a bacterial infection I would assume it's VA and use the recommended treatments for that,I see your using vagifem so try bottle washing after peeing,just use lukewarm water in a water bottle while straddling the pan,and use a good lubricant after,either coconut oil or yes or silk for the surrounding vaginal area.keep persisting with it you can minimise the discomfort by doing this,drink plenty water and keep the ph as neutral as possible.ideal number is 7 ish.you can buy test strips in chemist or on amazon.good luck and if any doubt see your gp.x