You should see a registered and experienced osteopath or chiropracter.
If you don't one of two things will happen. Either the actual problem gets worse and worse, or the body compensates and other muscles groups, joints or ligaments in the body get over strained. Over time whether one week, one month, one year or ten or twenty, etc, the end result is always the same, partial incapacity or constant pain neither of which will go away.
Untreated it will not get better and pain killers from the doctors only store up bigger problems for the future as well as being seriously bad for your kidneys and stomach.
Physio from a local hospital is ok except you usually have to waits months for it and it's a short term solution anyway.