Back pain or ache is usually not due to serious disease.
Most back pain settles quickly, at least to a stage where you can get on with your normal life.
Back pain can be very painful and you may need to reduce some activities for a time or even bed rest for a short initial period. But rest for more than a day or two usually does not help. It may do more harm than good because you tend to stiffen up. Keeping generally mobile is the accepted way forward.
Your back is designed for movement, and the sooner you get back to normal activity the sooner your back will feel better. Although, be aware that, this needs to be a graded return.
People who stay active and retain their normal pattern of activity, despite the pain, tend to respond better to treatment.