minty is the problem improving? Hw long ago was the fall? does the co-codamol work for the pain? If it does, its worth going back to the doctor and telling him/her about the problem and asking to have a stool softener prescribed. They work very very well. They need to be taken regularly (no pun intended) and will take a little time to work if your husband already has problems. He also needs to drink plenty of watery drinks as the softener absorbs water in the bowel to bulk up the stool (are we all enjoying sunday lunch lol?) In addition to a softener, a diet rich in fruit and veg (obviously) will help. If he is eating bran cereals, he must drink plenty, otherwise the bran just sets like cement and causes further problems. Fruit, which carries its own water along with the fibre, is a better option.
Tens machines work for some and not for others, I used one on my knee to relieve pain and I couldn't have kept going without it but I had to fiddle with the placement and settings and I am an Occupational Therapist (retired) and knew what I was doing. They tend to be used more for the management of a long term problem than for something that will heal.
Did the doc say what was wrong with your husband's neck? How long it should take to get better? When he would like to see your husband back if there was no improvement? Does your husband have any underlying conditions? Arthritis? osteoporis Fibromyalgia? that kind of thing.