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I feel like I want to write her a letter or something to try and get her back, ....it really is a shitty time and sometimes there is nothing I can do to stop thinking of her, especially right at bed time and times when I'd tell her about something that happened...
if it helps, remember that all 'love' is, is the word that humans give to the good and happy feeling we get caused by an increase in oxytoxin in our brain
oxytoxin is produced after all skin2skin contact eg massage, hugs, sex and orgasms; even increased eye contact will increase love hormones.
A close, loving relationship increases the production of this brain chemical and because newly single people start producing less oxytocin than those in intimate relationships this causes them to feel less happy. Basically you are in oxytoxin withdrawal. Your body is screaming for the drug you need to make you feel happy again.
(oxytoxin is also produced by mothers with new babies for bonding and even is what makes soldiers risk their own lives to save the lives of their buddies - its very powerful stuff)
The good thing is that any positive experience can increase oxytocin levels – and so can simply recalling positive events, but choose only to think of positive events other than those with this girl. Even petting a dog, cat or rabbit can increase oxytoxin levels.
The other good way of getting more happy hormones in you is exercise. exercise is excellent for increasing serotonin levels. Because serotonin is also raised after spending time with family/close friends, eg girlfriends you may also be a bit down on your serotonins too right now. Serotonin increases lifts your mood generally countering any feelings of depression or sadness. A long walk, run or workout will strongly raise your serotonin levels. Get your ipod on and listen to some upbeat music. This will also help get rid of any stress from your day and be a bit like meditation.
Sorry if this sounds boring but whilst there is a strong temptation to have a drink to help you relax/sleep, (been there done that(, it can be counter productive if you start to rely on it. Alcohol is a depressant after all and it makes you put weight on. You want to be at your physical best for your next gf

, not developing a beer belly. Alcohol also stimulates the release of the stress hormone adrenaline and interferes with the amino acid tryptophan which is used to manufacture serotonin. Exercise is a better way to get you to sleep and relieve your stress levels make you feel all round better about yourself and make you look more gorgeous.
Re nothing you can do to stop thinking about her....you can train yourself to replace thoughts of her with thoughts of something else. I think someone mentioned a 1 year plan. Create a new goal and a new focus. anything not girl related. Something acheivable. make a plan, work towards it. If you think about her at night still, get out of bed, do some situps or press ups, or if all fails read a really good book
finally read this article:
http://www.livescience.com/health/08050 ... eakup.html, abut a study which proves it wont be as bad or take as long as you think, and that the more positive mentally you are about your ability to recover, the easier it will be for you to do so