I can tell you from going onto Zoloft twice that
the first week *****.
The second week gets a little better and by
the end of
the third week you feel better. Granted everyone is different and will react differently. But,for your piece of mind, yes, what you are feeling is normal but if it doesn't go away after a week or two, you need to talk to your doctor.
Also, everything I heard and was told about zoloft is that you should not increase more than 50mg in 1 week intervals.