Anxious/nervous bladder. It treatable?

I'm 19 years old, I have had an overactive/nervous bladder since I was 15 .There was obviously an event that triggered this change . Over the last few months I frequently lose control (no wetting myself to clarify) when in 'uncomfortable' situations, this can be anything that isn't me being at home. If I sat at home all day I can go probably up to 4/5 hours without having to urinate when drinking healthy amount of fluids as well. Then when I leave the house and go out my bladder becomes far worse. Like at college for example I can go like 1 hour at best. Also then when feeling really stressed/anxious about certain situations or something I feel as if i can't hold and just feel the need to go very very frequently, the amount of urine passed in these situations is variable, ranging from drops to a worrying amount.Is there people who experience this? what is this condition? psychological or physical? Is it treatable?