Please really do call for that appointment with your doctor as you mentioned. I've struggled with depression my entire life, and yes it seems like you have most of the symptoms.

What has helped me in the past, and may help you, is if you force yourself to get some exercise outside your apartment for a little while every day (or every other day at least). You mentioned that you were exercising regularly up till about two weeks ago. It's time to start that back up again. It should be outside where you can get some sunlight.