Can anyone help me with building back strength?

I had rou-e-y 3 weeks ago with a hernia repair.i lost 2 units of blood.i went home for i week then had to go back to hospital with blocked bowels and a touch of pheanuominia.i am eating well but my problem is i am very,very weak.i can't seem to get my strength built up.i barely can take a shower without feeling totally exhausted.anybody with any ideas?????

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