 [ Symptoms ] i have been sick for over 4 years i have stomach pain cramps diarrhea mild constipation mild headache mild nausea fatigued [ Disease ] hi vision problems and sinusitis are the probable causes you may be having a significant refractive error and using glasses may well reduce the pain significantly if you have had a history of sinusitis then travelling may put your sinuses at risk of developing allergic sinusitis hot fomentation and using proper precautions avoiding dust and smoke will help both these conditions are minor and you should not worry about them you will be fine thanks