As a RN I cannot discourage your plan strongly enough. Self-diagnosis is not as accurate as you might think, especially when you're talking about something as emotional and changing as Bipolar Disorder whatever type.
Seroquel is an atypical antipsychotic that has a number, a large number, of possible side effects that range from small PITAs to dangerous. Dry mouth, constipation, tachycardia, sedation (often prescribed for insomnia in the elderly), and a laundry list of other possible side effects should really indicate that this is a serious medication. Your medical history is something that must be considered before beginning any new medication. I haven't even touched on possible interactions with other medications. This is what doctors are for.
Please, make an appointment, see a shrink or even your MD. This is a bad idea.