This sounds familiar, after my crash in 2007 I had some periods where I felt utterly charged, felt as if I'd literally been struck by lightening but couldn't actually have the energy or grounding to concentrate on anything, then I'd have low periods where I even found holding onto reality long enough to stand upright difficult.
For me, there were far more lows than highs, often expressed in fugues, moments when I'd be lost in a sea of uncontrollable impressions, sounds, colours, bits of thought just rambling through my brain, sort of the negative equivolent of that sort of creative connectivity which I usually so much enjoy.
Thinking about it I'd not even describe the high moments as high, more just energetic, like balancing on the top of a very thin spire, knowing at some point I'd topple off and be swept up by the sea of impressions again, and then after that be left gnum, dead and apathetic.
The best way I found to cope with these states was to employ as much cold logic and ceribral activity as I could, something utterly devorced from emotions, (even the emotion of winning or competing). I once spent close to 36 hours straight playing a resource management economic style space trading game, just because when calculating costs and losses and whether it cost more to take 30 units of robots from earth to sirius or 30 units of drugs to new carson, I was not having to deal with my own emotions, my own energies.
At points when even this was too much, especially during fugues, I'd simply fill my brain with information, sit and read an article on wikipedia with a list of pure and simple facts.
I was also on antidepressants at the time as well,which helped level things out but didn't actually remove any of the effects, all I could do was literally just hold on, wait for them to pass, come on this site and talk about my feelings or write poetry, and slowly over time the more I connected things the less I fugued or had those uncontrollable high moments, (I don't think I've fugued now for about three years), the closest I came was two weeks last saturday, and that wasn't a fugue, just a storm of negative energy and emotion, but this time I knew how to deal with it.
I'm sorry if this sounds harsh, but all you can do is what you are doing, keep going, work out ways of coping, talk on this site and eventually it'll get better, for all that I imagine you can't believe that much of the time.