You are suffering from UTI as a result of E coli
infection. Since it is not responding to antibiotics, you shoud get urine C/S done to know the sensitivity pattern of the organisms. Then the antibiotics can be modified accordingly. It`s not like candidiasis
caused e coli but you may be having co infection because of reduced immunity or candidiasis may be a local infection of the perineum
. The dizzy spells are because of generalized weakness which may come with any disease and medicines taken. Take care of your diet. Take rest and sleep well.