It can sometimes simply be the nature of things. You've done a cycle, you've come off, now you may not feel so hot for a while...it happens. However, only being off 1 wk, like strength said, this could very well be a mental thing, because you really shouldn't be feeling that way because of the cycle ending at this point. It could be that you're just a little run down and tired, you could have a touch of something and that's all it is.
As for your PCT, if you have the HCG, start it now, I always start my HCG 10 days after the last injection...if the cycle ended in all fast acting esters I start it around 2-3 days after last pin.
Start the HCG now, run it solid for 10 days at 1000iu/ed and then start the rest of your PCT.