It seems like you are in a lot of stress
. Adding to it are the symptoms you are facing. Do not worry; you will be fine soon.
The lightheaded feeling is due to inadequate fluid intake. Please consume more water, at least 3 liters in a day. Be slow while you stand up and lie down. You can take simple antacids like TUMS
for the gas problem
Yes, I do get the point that you are having flu like symptoms now.
The treatment is symptomatic with adequate bed rest; plenty of fluids orally, drink warm water, keep yourself warm, and wash your hands frequently. Most importantly, get yourself out of the anxiety and get back to work in a good health.
I wish you quick recovery.