Hi Cliff -- I'm in the UK too!! :)
Never worry about sounding self-pitying: you have good reason to feel frustrated -- this has been going on for a long time and you naturally feel exhausted and anoyed that you are being told to give it time. That said, if it's only recently that you've been diagnosed with bipolar, a little time for the meds to start taking effect actually might be just the thing (they could just do with explaining the process better!!).
Seratalin is the same as Zoloft (for you folks in the US with your whacky med names lol), and is a depression/anxiety med. Diazepam is a benzodiazepine, and is also used for anxiety (more a med for crisis moments than a maintenance med). Have you started taking these meds recently? Your psychiatrist may be waiting for you to adjust to those before adding anything else to the mix. If this is the case, do ask your psychiatrist what his/her plan for your medication is. If you have been on these meds a while now, then there is one crucial question: why on earth have you not been prescribed a mood stabiliser? (In fact I think, fromn what you've said about your changing moods, a mood stabiliser is the *first* thing you should have been put on when you were diagnosed with bipolar, but your psychiatrist may have good reasons for taking a different route, so that may not be a problem in itself). Please do ask your psychiatrist about this at the earliest opportunity. Apart from anything else, although anti-depressants are a very useful *part* of bipolar medication, on their own they can actually trigger mania.
I really don't think you should feel you have to hide the fact that you're bipolar from your close friends and family. For a start, bipolar has a strong genetic element so you may well find out some interesting facts about some of your relatives! Maybe you could start by asking your sister to help you in finding out more about the condition and the way it is treated. There are some great websites out there with information and loads of useful books (this is where I recommend David Miklowitz's "Bipolar Disorder Survival Guide" again folks! -- you can find it via the Resources/Books in the yellow column at the right of this page). I posted a list of really useful web resources for Chelle (seachell), who's also just been diagnosed, the other day in the Anxiety-Panic forum. Here's the link: https://www.healingwell.com/community/default.aspx?f=9&m=623705
I'm so sorry about your mother -- a very difficult time for all your family, and at times like this you probably need extra support (a terrible thing for anybody, but it counts as a "trigger" situation for bipolar, so it's no surprise that things are especially difficult at the moment).
Lovely of you to ask about us too! -- I'm 31 and live in the UK (down Portsmouth way). I came here at the start to find help with my ex who has bipolar (was my partner then -- yes, bp claims many relationships when it's not being managed properly). I found this group so warm and welcoming -- full of great insight and advice. As I say, since then my partner left (went completely blank, not taking bipolar meds, all very messy and painful), but I have remained here because I think it's so important for people who do reach out to have support and for us all to help each other through the tough times. I couldn't help my ex with what I've learned in the end, but I am so happy to be able to help all the lovely folks here.
Very best wishes to you Cliff.
Rosie x