I am Nancy and would like to help you with this.
Could you start by telling me what antidepressant you are on, how long you've been on it and what is the current dosage?
Here is a link to some information on Citalopram:
Read that - especially the side-effects.
You've listed many of the symptoms of depression - so I will go on the premise that you have depressive symptoms, and since you are at the higest recommended dose of citalopram - you should see a psychiatrist (not your regular MD, because they don't know much about combining psychotropics) about adding another medication on top of the SSRI you are already on. There are some medications, when taken in low doses, that boost the effect of the first medication - and that will alleviate the depressive symptoms you are already having.
The psychiatrist will take a medical history to be sure he/she is prescribing the right thing - and then, after that, if you want your regular MD to continue to prescribe it you can do that - but be sure to get it from a psychiatrist - you want to take the right medication - in the right dose...
Is there anything else I can help you with tonight?