Developed foot drop 3 weeks ago (neuropathy). sometimes i can lift it, sometimes not. seems to lift more, getting better?

Foot drop: Sounds like nothing to fool around with & needs a medical evaluation. A foot drop is usually due to compression of a nerve w/damage. Can be due to nutritional disorders (you had gastric surgery), traumatic due to pressure, loss of the myelin sheath on the nerve interfering w/conduction or invasion into the nerve by inflammatory cells or malignant cells. Need:check up, labs, scans based on p-exam.

See below: You need to consult a doctor asap for this type of problem. It could become permanent.