K.I.
Yes, while I was pregnant with 2 of my 3 kids I had the "lump sensation" even went to the Minor emergency once because I had convinced myself it was effecting my breathing...it effected my swallowing, so there for made me self conscious of it and thus my breathing...and oh, did it suck.
They did nothing for it and said I was fine. They were right, I was fine. It still was very real and uncomfortable for me.
My only comfort to you is that it did go away...and someone else knows what you are talking about!