Week 10 - 15mg Citalopram (Anxiety)

First timer here… Six weeks on 10mg citalopram all seemed to be going well, until additional work pressure and couldn’t cope with the stress and had a dip. GP upped dose to 15mg and now on week 10, been having a few good days, then some consecutive days but it’s the off days thats catching me. Sleeping great, over thinking minimal, jittery feeling better, anxiety on the ‘mend’ then it all comes back sometimes for a couple of hours but it does lift but this weekend had it for few days along with the head chatter, low mood etc and then it lifts. Can anyone relate? Any advice greatly appreciated.