Depressed or not? Watch
I think the biggest problem you have had from what you have written is that you have kept everything to yourself. I think it would be good for you to tell someone close to you about what has happened and how you are feeling (even if you sent them a message on Facebook).
You shouldn't be ashamed that you haven't told you Boyfriend. From that and everything else you have written you seem like a very caring person but at this time its important that you have someone there to care about you.
Whilst I don't know what you have gone through, I do know the feeling of not wanting to (or not feeling able to) tell anyone how you're feeling, yet I imagine pretending that you're okay will start to feel quite emotionally draining after a while.
I really do think that telling someone, even part of how you're feeling will make you feel better. Keeping everything to yourself is only going to make the idea of finally saying something harder and will just put more pressure on yourself.
If you don't feel as though you can tell someone close to you or you are worried about burdening them, then you could always talk to someone objective like a counsellor who may be able to offer you support.
Also, with regards to your sex drive, It is more than likely related to the fact you have been quite stressed and down. Don't put too much pressure on yourself, why not try just relaxing with your boyfriend and going out or doing some casual things you both enjoy (keep communication as open as you can).
P.s. if you are worried you could have depression going to your doctor could help you.
Hope things feel better soon,
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I agree that you could also benefit from talking to a counsellor - if you're at uni they've likely got a free service - and seeing a doctor would be a good step too. You'll probably find that once you do tell someone you're close to, they'll become less worried if you show them you're seeking help.
Hope you and your boyfriend both recover soon.