I am 38 and I have been having these infrequent sharp pains lasting about 30 secs to 1 min in my left underarm. This morning I have already had three episodes. They are about 10 mins apart. I smoke 1-2 packs per day and I take Zoloft, multivitamins, fish oil, and a male stimulant for sex drive. I figure I am too young to have heart problems but I guess anything is possible.