>>76413754 (OP)>can't lift anything above 5KGKnow your limits, lift 2.5kg. Is it wrist extension, contraction or rotation that causes pain? Figure out which movements cause pain, then figure out which tendon is fucked up, then figure out which exercises get bloodflow to the tendon.
do these light movements every day to get more blood to the tendon, warm up before- soak your hand/wrist in a bowl of hot water, do some cardio to get heartrate up, then your pussyweight exercises. If you feel minimal pain then you can progress in weight/reps
Clean up your diet, get plenty of collagen/protein in, get lots of sleep. Avoid stimulants as much as possible (caffeine, nicotine) they are vasoconstrictors and fuck with collagen synthesis. Keep at it for a few weeks and you should see improvement