About 3 months ago I started to get pain in the sternum when I paddle out, sit up on board, etc. Its not the normal rib pain you get when you haven't paddled in awhile. It like a ligament pull just under middle of chest. When the pain really acts up its pretty sharp when I first start paddling. Close your eyes, suck it up, keep paddling pain and dont arch back up as much. Suck the stomach in to sit on board. I thought it went away as I was in mainland mex 2 weeks ago and all was good. Now I just just reactivated it with this little south swell. Ive been surfing 40yrs since a little kid. Never had this one nor heard of anyone complaint about it in the water. Thoughts?