Do we have a circular bone/joint at the side of the wrist? i've lost weight and it became apparent to me. i am afraid that it might be a swollen lymph node but it doesn't hurt and i don't feel anything. but sometimes my hand feels tired since i work?

There are usually no lymph nodes at the wrist, the round structure you may be feeling could be the lower end of ulna bone. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV and Covid vaccines. Wish you good health!