Hi

A healthy way to loose weight by diet and exercise is to maintain the weight loss to 2-8 pounds in a month so as you do not develop weakness. If you are loosing more than that please modify your regimen and if it you are still loosing it consult a doctor 

Weakness; Loss of appetite; Stomach pain; Headache; Diarrhea or constipation; Cough.

Please mention site of ‘chaale’. If they are inside of oral cavity, then they are called oral ulcers and treatment is daily dose of vitamin b12 and local application of smyle gel. Also, avoid spicy food. Please see a dentist in case they bleed or your gums bleed.