Quetiapine (Seroquel) is a very viable option for the treatment of bipolar illness. Contrary to popular belief, it is effective for both mania or depression, although acutely, it won't do much for depression, but will conversely help mania. It will, however, keep you out of mania OR depression at baseline, much like lithium. Side effects are significant, i.e., sedation, possible TD/extrapyramidal symptoms, but Lithium's no walk in the park either, has a very narrow therapeutic ratio, and requires regular bloodwork. Lithium is a good drug, an old standby, but isn't necessarily a silver bullet, and research has borne this out.
Zyprexa (Olanzapine) is better than Seroquel in bipolar illness, works in both mania & depression. In one study (I'll dig up the cite if you'd like), bipolar pts were started on both Zyprexa & Lithium, most did fairly well, then some were taken off Zyprexa, and some off Lithium, the pts going off Lithium & staying on Zyprexa did better, FWIW. I'd look into it. Speak w/ your doc.
Feel free to PM me with any questions.
And to all of you posting who don't really have a clue about psychotropic meds, please stop. I don't mean to be rude, so please don't take it personally, but I feel that this is someone with a medical issue seeking help, not someone looking for a high or an opinion about a high, and some of the responses are just uncalled-for.