My brother is having a pulsating pain that sometimes is quick single thrust, sometimes several really fast pain stings , sometimes it hurts, sometimes just irritating. The pain is on the left side, starts about breast level and goes up under the armpit and down halfway down his left side. The sharper pain is just in front of his arm-pit area. He has been dizzy all day as well. This has been happening most of the day. He is 55 years old, 5 6 , not overweight, play tennis for excercize. He just worked an all-nighter 2 nights ago but had a good nights rest last night. His work is not physical labor, but high-stress because of all the controls he has to keep in perfect balance for his job. Any suggestions would be appreciated.