119 lbs/ 5'6" ft inch. i want to gain some weight. i do weight training and eating 6x a day. still stuck on my weight or tend to lost 2-3 pound/ week?

Multiple reasons: You noted that you have bronchitis and are on a bronchodilator. Do you smoke ir hsve asthma? Both can affect byour efforts to hsin weight. Checked for diabetes, and especially thyroid disease? Do you have diarrhea? Intestinal disease or parasites might bevthevproblem. Have yourdoc check these out and go from there.

Good regemin: Muscle tissue is more dense.Increace the weights and lower the reps to build more muscle.