Hi Marie,
I was not sure but asked my Dr.....I have had the MS hug. He confirmed it for me. Mine was like a a tightening in my chest very severe nearly took away my breath. It even traveled into my jaw and I thought I was having a heart attack, got sick to my stomach and sweaty too. Can't say I felt it in legs at all, but it did go all the way around to my upper back. You should ask your Doctor about it just to be on the safe side. Good luck with this, I am only sharing what I experianced, others may have had it differently. Mine happened a year or so ago and it has happened twice before that. I had to even go through a heart cath twice, which was normal both times. I do know Acid reflux, which I also have can feel like that ( what I felt) at times.
Hope you find out whats going on, Keep us posted. Hugs Katie