Thanks Kate, I just sent a reply but I don't think it worked (apologies if you get this twice).
I will see my doctor and ask for a referral. It's difficult - I go from really identifying with the symptoms of bipolar, to then thinking it's all stupid that I'm even thinking about it and actually I'm just normal like everyone else and experience the same ups and downs that we all face... It's hard to gauge what is normal and what isn't when you start looking into these things.
I haven't thought about seeing a neurologist before - something that frustrates me is my memory, it's awful and seems to be getting worse. Trouble focusing on one thing and especially reading is very difficult for me as well. May I ask what is involved in a neurological screening? What would be achieved / what would be the outcome? And how I might go about getting one?