Left Side Numbness n Lump In Tummy

I'm not sure if i am writing in the right section as i don't know whats wrong with me.  It all started back in March 2006, i got a lump jst below my left breast, feels like a fatty lump on my rib cage.  I went to the doctors as it was sore and i kept getting numb and tingly feelings through it, along with very sharp pains from time to time.  The doctors took several blood tests and sent me for x-rays and an ultra sound.  Everything came back clear but the pain still remained in the left side of my tummy along with the lump.  Then i went to turkey and when i got off the plane my leg was quite numb for about 2weeks.  It has now been 6months since i first got the numbness in my leg but i get it at least 8times a days all down the left hand side of my body.

Have you any idea what could be causing this??

Thank you

ps i wasn't bitten or anything while away.