Paranoia?!

Clare
So I'm 15 weeks (yay!). For the majority of my pregnancy so far I've felt rubbish - trouble sleeping, problems with going to the loo, fussy eating, tired, aching etc etc. Yesterday I woke up and suddenly felt 'normal' again after a great nights sleep, and today I feel pretty good. I should be happy but instead I'm just worried that it's because somethings wrong. I've had no spotting or cramping so no reason to call the midwives, just a feeling (or perhaps being paranoid!). Anyone else had the same thing and been ok?!