I feel for you and my heart goes out to you. Being afflicted with bipolar disorder is no fun and creates many life challenges.
Try to ignore the glib posts of the passing-through idiots/a-holes on this board. Most of them do not/will not understand or be sympathetic or understanding of your condition, the symptoms, or about how it affects your life. Many of the arrogant/a-hole posters are simply just young gunners competing to get into a good law school that are fueled by hopes and dreams of six figure $$salaries and luxury cars. Sometimes they try to increase their chances of success with attempts to impair the performance and chances of others.
I'm not bipolar but I have a lot of direct experience with people that were dealt a bad genetic hand and afflicted with the biologically based brain disorder. I performed clinical assessments, cognitive tests, observations, research studies, etc. with many patients admitted to a lock-up neuropsychiatric facility for roughly two years before I went to law school.
Also, over the course of about five years I lived in an apartment with a spare room that I rented out short-term to people moving/in transition that needed a temporary place to stay. I ended up having a few Bipolar tenants pass through during that time.
My Ex-girlfriend I was in a relationship with for almost four years turned out to be Bipolar and the beginning of the worst phase of it manifested and was diagnosed after she moved in and we were living together. That really sucked because she was rapid cycling and taking massive amounts of ADD/ADHD meds every day (Adderall, Dexedrine or Desoxyn), whatever she could get a doctor to Rx her. She hid that habit from me for months, I learned about it later once she started having frequent psychotic episodes and started popping the pills in front of me, up to 40mgs at a time.
The amphetamine and other ADD/ADHD stimulate meds/drugs put her into paranoid delusional psychotic episodes frequently, usually within an hour of when she took them. She refused to take any of the medications for Bipolar except when forced to in the MANY times she got locked up on a psych hold (5150/5250 in CA, Baker Act Hold in Florida, etc.). She was and possibly still is (if she is still alive) adamant that she just has ADD/ADHD, loves the amphetamines and argued that they are the proper drugs for her. From direct observations, many stories that would take hundreds of pages to write, I knew they were the wrong meds for her condition but she wouldn't listen to me or the various doctors.
ADD/ADHD and Bipolar are frequently confused with one another and/or misdiagnosed due to similarities of the symptoms and other reasons including affects of drugs the patient in treatment has been taking.
The one medication that worked wonders during the brief periods she took it was Abilify. She snapped back to normal instantly and it's a one pill a day med. Unfortunately, her attitude once out of psychosis and back to normal because of the medication was "I'm fine, there is nothing wrong with me, I don't need these" and then she threw them away. Medication compliance and substance abuse issues are a common problem with Bipolar afflicted people.
Anyway, long story, ExGF is currently a fugitive on the run with many warrants out for her arrest and I have a restraining order against her due to many domestic violence incidents when she was psychotic, got violent, and the police showed up. Her current/recent situation that I know of is mainly because she refused to follow medical/psychiatric advice, take the proper meds, follow-up with and be honest with the doctors.
The biggest problems I've noticed with Bipolar people are medication compliance, showing up for follow-up care, being honest with the doctors/therapists, and substance abuse.
Regarding getting extended time for the LSAT, you can give it a shot but it will most likely be a long difficult, very time consuming, frustrating, and expensive road with an unfavorable chance of success. They don't grant extra time accommodations easily, especially when the basis of the request is for psychiatric attention/concentration/mood disorder related issues.
Best of Luck to you.
Being Bipolar is not the end of the world.
Many very successful and famous people over history that have done and contributed amazing things to humanity have been bipolar.
Here are a few links:http://www.mental-health-today.com/bp/famous_people.htmhttp://www.famousbipolarpeople.com/
PS: Here is a great song from Sting that is wonderful. He is Bipolar, has admitted it publicly, is very successful and has created many moving songs and videos amongst other things.http://www.youtube.com/watch?v=037uSAIahho&NR=1