Waking up to a sore back

Was it my old bed cushion or I just overslept?
My back is aching from the nape down to my sacrum.
I guess it was not due to oversleeping because I am constantly being awakened by my aching back and it was relieved by lying on either of my sides. Also think that because of me not taking my calcium supplements and taking too much coffee as my pick me up in the morning.
First thing I did when I got up from bed was to dial the drug store’s delivery hotline. My supplements will be delivered this afternoon.