As a practitioner of Reiki and Craniosacral therapy, helping fatigue (e.g. M.E.), insomnia, anxiety, stress, injuries, trauma, grief, depression, fibromyalgia, chronic (and otherwise) pain and many other conditions, I find that pacing can be an extremely valuable tool.
The graphs below show a person's activation due to stress over a day. The person in graph 2 has been able to recover somewhat after each stressful event so that the peak stress of the day is much lower and they are likely to have a much better night’s sleep and calmer day tomorrow. There are things we can do to improve our ability to recover from stressful events such as Meditation, Craniosacral Therapy and Reiki. Just taking a moment after each event can also be really helpful, perhaps focus on your breathing or do a little resourcing (at its most simplistic this is thinking of something that makes you feel good- it can be a place, sound, smell).
The graphs describe the stress for a certain day although a similar effect can be seen with the build up of pain over a day. For this the events would involve occurrences that bring on pain and resourcing can also be used to help calm it down again afterwards.