You'll gradually bleed out all of that emotional resin - don't worry about that. Concentrate on the bigger picture - YOU. Not her, not your past with her, not what she might be thinking right now - no...YOU.
Anything that keeps you active - reading, school work, work, working out, hanging out with friends, whatever hobbies you may have (if you don't have any or want to add on a new one, now is the time) - is good.
Anything that keeps you staring in the rearview mirror - dwelling, looking at pics of her/old text messages/emails/facebook postings, spending lots of time alone doing nothing - is not good.
A bit reductive, but they don't call them "two cents" for nothing. It's been almost four months since I split ways with my ex and I think I'd need a defibrillator at this point to revive my emotions for her. Don't be too hard on yourself. In a sense, you've already 'graduated'.