It is very easy to get lost in the moment but try and look at the bigger picture, this time next month you won't feel like this.... this time next year will be sooooo very different. Although a year seems like a long time... even a month come to that... it really isn't in the scheme of life.
If you want to go back to bed, embrace it, have a lazy day! Watch a film, cry, eat copious amounts of chocolate! But whatever happens today put in mind that tomorrow you will go out somewhere... even if its just down the road to the shops. Small steps, do not expect massive changes. Set yourself realistic goals and then when they are achieved you'll find the courage and strength to cast your net wider.
The best things in life, the best lessons, are never easy but that is a foundation element which makes us stronger from them. You will end up being such a strong person, keep in there.