Much too much water. Weed prefers dry soil to grow, so water thoroughly when you do it, but do it less often...rather than little and often. Only water when the soil is basically dry is my advice.
This allows the soil to dry out in between watering so that air gets to the roots.
The drooping leaves are a sign of under/over watering and/or heat stress, how often do you water the plant and have you fed it any nutrients? If not now would be a good time to start.