My God, don't you have a hand truck? I used to do HVAC work, and if your contract is that flimsy, you need to SERIOUSLY consider finding different work.
This blood in the urine thing is VERY troubling. You MUST NOT and can NOT afford to ignore this, especially with your stated past medical history
Not only could this put you out of work, it could kill you.
the FIRST thing to do is tell your wife, and the second thing to do is call your doctor