Thanks for your question on Health Care Magic.
I can understand your concern.
By your history and description, possibility of recurrent viral infection is more.
Spread of viruses is common in family members.
Amongst viruses,
Influenza virus is the most common cause for these symptoms.
So my recommendation is to take annual Influenza
vaccine.
This will provide immunity against Influenza for one year.
You should also take raw green leafy vegetables, fruits, pulses, milk etc.
Also start
protein supplements,
multivitamin tablet,
probiotic (antioxidants) drugs etc.
Don't worry, you will be alright.
Hope I have solved your query.
Wish you good health. Thanks.