My nail seems to be detaching itself from the nail bed?!?!?

Okay so I have come to the decision to stop chewing my nails lately. Its been hard. My nails are thanking me for it (sort of). they have started growing normally. Except one. My "rude" finger, the nail is growing like all the others but for some strange reason the white bit (toward my finger) seems to be a weird shape. it looks like my nail is lifting off my nail bed. I have been scouring the internet and have found some stuff but nothing definite. I have been having trouble sleeping and im wondering if its my thyroid gland contributing yet ANOTHER problem ? any help would be great