When I go for a wee afther I feel like I need to go again it don't sting at all been tested have no water infection what could this be?

Urinary retention. That is a question best answered by a urologist.
Overactive bladder? If you have been thoroughly tested and found no infections, and not taking meds, it could simply from a condition overactive bladder--your bladder squeezes too much, too often--making you want to pee often even when there isn't much urine. There are medicines which may help. Consult your doc. Good luck.