How bad is your vomiting? if you vomit right after drinking I suggest you to stop fasting. if you think you add enough water to the system from drinking(not as frequent), then what you're experience is fine.In case you begin to lose stools stop fasting and even go get a doctor to prescribe you pills to stop it. In case it's not that bad and you think you can handle it, try to think that these symptoms are good for your body because it's trying to achieve a balance.

If you feel very weak and you think that symptoms are too extensive and you're not sure if it's normal or not then you can try drinking some kind of juice (fruit) like orange juice. don't worry about drinking juice! juice'll not bring you back with the process whereas just will slow it down. If after drinking it you feel less nauseous than before I did not worry and even continue fasting.

You need to keep in mind different people feel different symptoms when fasting, while most of them are a sign your body is trying to get more balance, in rare cases they're bad for you. for example vomiting may be a symptom comes from your nervous system. While fasting the CNS may be unstable and very irritable causing many different symptoms like shaking, anger, anxiety even depression and emotional instability - these are very good symptoms and when you get a relief from it you may feel much better.