What's the best way to get help if i am isolated and feel suicidal?

Go to the ER: If you're suicidal, you need to be seen as an emergency. If you're already working with a psychiatrist or psychotherapist, you need to also contact that person. They will want to know so they can help you, and also help the staff trying to assist you in the er. Longer term, you'll need treatment for the issues leading to suicidal feelings -- this can come as an outpatient w/psychiatrist, etc.