15 days, awesome!! you give me so much inspiration! whenever i fast for even a day or 2 i always get extremely headachey. it really sucks :( i always end up taking a lot of excedrine when im fasting and trying to drink a lot of water. as for being super sensitive to sounds, i can definitely relate. i always get really irritable while fasting and if someone scares me suddenly my reaction is always multiplied by 10. it sucks and i have no advice for that other than to stick it out. you are doing awesome, congrats on 15 days i am sure you will make it to 20 or 21 (or even more!)