thanks for Writing to HCM,
your problem is surely very painful and bothering you a lot but you didn't mentioned any medical help/ treatment taken for it till now.
The knot (or lump) is a major concern here. It has to be well diagnosed first before starting any kind of treatment.
A X-ray spine cervico-thoracic showing that knot (both AP & LAT) view is required, and some blood tests- CBC, BLOOD SUGAR.
If anything comes out in these tests then treatment has to be done accordingly.
We definitely need to know the origin of that knot.
if all the tests are normal and it is a muscular trigger point then physiotherapy
can help you.
hope this helps you
wish you good health