I m 28 and last night I had a stabbing sudden pain in my lower back leg, 15 minutes later that same sudden stabbing pain happened in my upper chest . Followed minutes later was dizziness and tremor like shaking. I didnt seek any medical attention. I rested and all the pain and dizziness went away, however I had nausea for an hour after all that. I went to sleep and awoke today with no pain, just slight soreness in leg. Any ideas? I am under pressure at work with project deadlines (I sit all day long as an engineer). I also am 6 0 tall, 210 lbs, have never had a health problem. Family history of heart problems, but nothing until after 50.