It sounds as if you haven't had much fun as a couple over the past 3 years, and it can be mighty wearing for anyone to have to deal with a depressed or emotionally draining high maintenance partner/spouse without any sexperiods of light relief.
Face the fact that you're not going to get him back by bawling your eyes out, clinging to his ankles, or guilting him into returning, and start getting your act together.
The more you cry, the more turned off he's going to be and the more he'll be convinced that there's nothing for him to gain by returning, so dry your eyes and resolve to stay tear-free when he comes to collect your dc.
Stop apologising, stop begging, and ditch the 'memory box'. It's guaranteed to irritate him - don't you think he's capable of remembering what he wants to recall when he chooses to do so?
Stay cool and calm when he's around. Don't ask questions about where he's been or what he's been doing and don't nag him - above all, don't mention the 'M' word and, if you can't find anything humorous and lighthearted to say to him, don't bang on about anything other than what your ds has been up to... and make his activities sound as jolly as possible.
There's no guarantee that he will want to return, rekindle, or otherwise resume a live-in relationship with you, but there's no harm in reminding him what he's given up on by being the woman you used to be; the one he was attracted to before the misery set in and you made him feel bad because you were feeling bad.
Of course, you might not have done anything to bring about the demise of your relationship and he might simply be an uncaring twunt who's not worth having back but that call is yours, and if you want him you're only going to re-attract him by dispensing honey rather than vinegar.
That's your game-plan sorted and in order to give it some oomph, get yourself to your GP, seek treatment for your bulimia, and get yourself some anti-ds to take at night after you're done with forcing yourself to throw up and before you go to sleep.
And don't bare your heart about that aspect of your life to him until you're damn sure that you've overcome this tendency to self-harm and that he's back home for good... if you feel that you truly need to burden him with what is essentially your problem, I suggest you wait until you've shared a couple of years of blissful harmony before doing so.