Re: Excruciating Pain HELP!!
There could be a number of sources of pain but the most likely is a problem with your Achilles tendons. You could have some form of tendonopathy which may be amenable to a particular form of exercise. Sometimes the cause of this is due to a problem with the joints of the hind foot In which case getting the right sort of runners and sometimes orthotics can greatly help matters. In addition the alignment of the trunk and lower limbs can all take a role in poor body mechanics when you run.
I would recommend you see a MSK/sports physio who can give you a thorough assessment. For example they should watch you running on a treadmill. The physio may identify any problems you are having with your running and check and the joints, muscles and tendons. They can then advise you on the best course of action.
Usually these problems can be helped and can get you back to effortless running.