You have not said which part of your abdomen is painful! Obviously, the range of possibilities are too many.
A blood count of 13 may be indicate infection - It may the appendix
, gall bladder
, urinary bladder
and so on.
You have stated 'heart rate' - I presume you mean Blood pressure! 144/93 is a little high and can be from pain, infection etc One has to check again. So is pulse of 103
Watch for fever
An USG (UltraSonoGraphy
) could help. A repeat examination after a few hours also helps
You should see your doctor again