Please read the thread on breathing I posted (use search then Prof. Akers) start here before anything else.
Get your breathing sorted out first!

I'm not an expert but I would guess that you've reached a block in your subconscious that is preventing you from going further.  You are resisting something.  And the more you resist the harder it will be to get back on track.  Don't judge yourself for not meditating or feel badly or guilty about it - that only makes it worse.  Wherever you are right now is where you are supposed to be and it's okay.  Sometimes when things seem bad they are actually good because it means something is shifting and moving forward even if it's uncomfortable at the time.   Just bringing attention to what is going on when you don't meditate or do healthy things for yourself will help dissolve the resistance.  You don't have to intellectually figure out what the resistance is, just be okay with whatever is going on at the moment.

I've gone through many many ruts with my meditation and lifestyle.  It's all part of the journey.

Go ahead and sit, take the time.  If you sleep, you are still getting something you need.
If you find other things to do, be gentle with yourself and just sit, find a pretty flower, something wonderful, go outside and sit down and sit the time you want to meditate and appreciate the plant, the mountain, the nature around you.
It will return to you.  
Give yourself the space that you use for meditating to just be, whatever it is for that time.
Be gentle with yourself and yet give to yourself the time for appreciating.

Try something simple. Take the time for at least one hour or longer to be with nature. If possible do some gardening. Get your hands dirty. Be surrounded by greenery and birds. You need to begin feeling nature again...

Good luck.

Rohiniranjan