Holden apollo 92 may have engine/transmission troubles..help?

My holden apollo 92 model... suddenly lost acceleration and would only go faster than 30ks if the accelerator was pumped... to act like a clutch as it is an automatic. There also seems to be a high pitched rattling sound and the car now moans and it felt like the hand brake was on while driving (which it wasn't). It also stalled twice in 2 mins when I came to slow down or a hault. Does anyone know what happened????