Please tell me how to heal eroded teeth

hello there,
I am so much depressed and so much worried about my teeth right now. Few days ago I woke up and did the brushing teeth, while I was eating breakfast I had a feeling on teeth, I touched them with tongue and felt cut there. I went to check it in the mirror and found that there were no more than four teeth had erosion, two had minor erosion so tiny that can't be seen while other ones had small holes on the enamel.I went to the dentist he told me that it happened because of soda like coke, pepsi, red bull and booster. He filled one of the teeth with composite filling and said I should check if I am comfortable with it. I had it filled seven days ago and but it came out while I was chewing on food. It made me think that filling might not be the right solution for eroded teeth. The other three teeth have small holes right now. I will leave them right now. The one that had filling has gotten bit bigger due to drilling, ever since the filling came out I am unable to drink water.