Talk to Cardiologist on Post Bypass Surgery Recovery Complications

3 weeks post quadruple CABG, wounds healed, extreme weakness and some tremor in hands, Anemia (7 mg/dl), creatinine 1.3, slightly low sodium and albumin, can get up with difficulty and walk only a few steps without support, was walking normally before surgery, significant dependent Edema. What is the solution to weakness and reduced mobility? How do you start walking without support again? Is feeling cold and hand tremor a sign of severe anemia?