Hi there!
Well, I am not really well versed with the chiropractor practice, though if it was because of the ‘adjustments’, the symptoms are likely to have occurred the same day and unlikely on the following day. Backache could be related to spinal issues such as degenerations, inflammations; neuro-muscular causes, growths/ masses referred pain from other regions such as in renal issues etc. It would be best to consult an internist for a detailed evaluation at this time. After a cause is identified it can be managed accordingly or specialist care may be sought. Meanwhile you could try bed rest, ice-packs/ warm compresses and OTC tylenol/ NSAIDS for pain relief and see if these seem to help.
Hope this is helpful.
Take care!
P.S.
I forgot to ask what is the best thing to do for the pain. Horrible pain...left lower back. If I move at all it hurts. I have to jab my fist into that part of my back with one hand and hold my husband's hand with the other in order to move/walk/sit/stand...otherwise it is unbearable. Any advice is appreciated!