My hair is hopeless. I used to have big fluffy natural curls but somehow it just won't go curly or hold curls anymore. This has only happened in the last 3 years. I've tried every curling method I know of - irons, wands, pin curls, dry rollerset, wet rollerset, gobs of hairspray or holding liquids, the curls just won't hold, after about an hour they fall straight. What do I do? Please help.