It felt like a knife in my back. this is the second one (blood clot in lung) i have had. (one ten years ago) It happend on my 65th birthday. Bad birthday present. good news i had medicare and AARP supplemental so no medical bills (always have to look for the silver lineing. LOL) I am takeing elequis blood thinner and it took two months before the pain went away and i started to fell better. Spring is here and the fish are starting to bite Good luck, good fishing and good health to all my Crappie friends.