Welcome to Just Answer !
Well, it must be really frustrating for you to be looking for a proper treatment while your depressive conditions are overwhelming you.
Well, as far as you being placed on citalopram 30 mg , i would say that it is a fairly good drug for major depressive disorder , but alone it would not be able to treat your depressive condition, so i suggest you ask your GP to add a MOOD STABILIZER such as Lithium or Valproate , also this addition of a mood stabilizer would prevent any impending Manic episode , as you are a high risk for Bipolar disorder , as by your own admission , you have a family history of Bipolar ,and the fact is Bipolar disorder has gentic basis and runs in families , so you have genetic loading.
Also , what happens is that a person like you who although has a family history of bipolar disorder might never had any episode of mania so far, but while putting you on anti depressants ,, for treatment of depression, the anti depressant may unmask ( uncover or precipitate ) a MANIA, thus it becomes imperative to use a mood stabilizer in your case , as told earlier for two reasons-- 1) To assist citalopram in treating depression and preventing MOOD SWINGS.
2) To prevent impending manic episode .
And as far as your confusion , regarding which type of specialist you should seek help from, i suggest you consult a Psychiatrist , either ask your GP to refer you , or call NHS helpline and ask for the practicing psychiatrists in your area , or consult a private psychiatrist. Meanwhile, you look for a suitable psychiatrist ,ask your doctor to place you on a mood stabilizer such as lithium or valproate , to be given two times a day , and ask him to place on a low dose.
So, i suggest you discuss the above mentioned treatment modality with your GP, AND get started on it right away, and i am quite sure adding a mood stabilizer would keep you off the mood swings and put you on the right track to recovery.
I wish you best of health.
I hope my answer serves your query according to your satisfaction.