Chiropractor said "subluxations of the neck and back" kids also have them? confused? severe pain.?

I went &saw a chiropractor he did xrays my neck is too straight pinching nerves causing 4 of the vertebrate to be stacked straight in a line, makes my head stick forward, my spine curves to my right maybe 2-4 inches off center at the worst point, having severe headaches(getting new gles might help) lower back and neck pain severely for a couple years. I had a cat scan no tumors or growths, doctors at hospital said they are tension headaches couldnt explain spinal pain. So anyways he "adjusts" me and oh boy did that hurt, says come back tomorrow. So I do and he adjusts me again and then we go over my xrays. Points out the problems(also adjusts my kids and said they need to come once a week, they are 4 mo and 21 mo)and says he would normally charge 6,500 4me but in a package deal(seeing him 3x a week for 84 sessions)3,000 upfront or 200 a month and if I give it all at once 15% off up front I am not a gullible person and I am very nervous about this but I hurt so bad,will it help?