from the history it is clear that you are having glaucoma
and had surgery for it. so the scarring and bubble in the eye is actually the filteration bleb which is required for reducing the pressure inside the eye. so need not worry about the bubble infact it is good prognostic sign. however severe pain
watering may indicate raise of pressure which may require to change or increase the drops used to treat or reduce the eye pressure. So consult your doctor for pressure check up and to decide on further mode of treatment.