I would like you to accept my thanks for sharing your problem with me. First of all you need to understand that Gardnerella is a kind of vaginitis and it is a result of overgrowth of organisms (one or more) that are present in a vagina. This creates an imbalance of the natural breeding vaginal bacteria. The main characteristic of this infection is the secretion of a greyish-white discharge which is mostly foul in smell. This odour is often said to be fish like and becomes at time more obvious after having sexual intercourse or it could be an indication of sexually transmitted infections. The treatment that you got from your doctor is right, Clindamycin in any form that means vaginal gels, tablets or creams and metronidazole creams, tablets or gels are known to be good for the treatment of Gardnerella. Apart from the medical advice and treatment it would be of importance for your husband to get him tested and simultaneously treated as I could probable see this as the cause of you getting infected over time and again. But before you get on this, I would suggest you few remedial measures that will help you not to exaggerate your condition. What you should do is to avoideddouche; also do not use scents or soaps with deurbanising and anti-bacterial properties on or around the vaginal area and also take extra precautions to avoid sexually transmitted infections as much as possible. I hope for your quick recovery. Take Care of yourself.