Welcome to Healthcaremagic.
I have gone through your query and understand your concern.
Most of the people fully recover from dengue
fever, although the weakness and fatigue
may last for several weeks.
It may some more weeks to recover your normal health.
Because it is a life threatening infection.
Thank god for not being done any worst things.
It is very usual to have gastritis
and other abdominal issues after recovery from fever.
It is most commonly by the Heavy dose pain killers and as well as by dehydration
Take some antacids, proton pump
inhibitors like pantaprazole just 20 minutes before food for a week.
My advise is to drink plenty of fluids, eat green vegetables and fruits, take rest for two more weeks and gain health before going to work.
Hope this helps.
Please reply for further queries.
Wishing you good health.