I can't sleep quickly and when I wake up, I feel still tired with some back and neck pain. What can I do?

See below. This could be a variety of issues. I recommend sleeping on your back with a pillow under your knees. Try to get between 7 to 9 hours of sleep. Use a comfortable mattress. Perform stretches of your neck and low back before getting out of bed for a few minutes. Exercise sith focus on the core muscles of the neck and back. If the symptoms continue, see your general medicine doctor.
Insomnia. There are lot of things which can cause sleeping problems, commonest is too much caffeine, or other rx meds which can keep you awake, if you are overweight, get tested for sleep apnea, also get your thyroid tested.