I sometimes get a really deep ache around my back at waist level( like my waist is being squeezed real tight) but then goes right through me and seems to go down the front of my legs -kind of feels like the ache forms the distribution of lap rug if that makes sense- it is really intense, to the point that i just don't know what to do with myself! it seems to last several hours then gradually eases off. I have often wondered if this is the MS hug-i have had back from pinched nerves before and it feels different to that