Thanks for your question on Healthcare Magic. 
I can understand your concern. 
In my opinion, you are also having viral infection. 
Since your husband it having 
cold, he might be spreaded infection to you. 
Your all symptoms like 
fatigue, 
diarrhoea, flu symptoms are suggestive of viral infection only. 
So drink plenty of fluids orally and keep yourself hydrated. Avoid oily and spicy food. 
Do warm water gargles 5-6 times a day. 
Take antihistamine and anti inflammatory drugs. 
Avoid 
stress and tension, be relax and calm. 
Don't worry, you will be alright with all these in 3-4 days. 
If you are not improving after 3-4 days then 
consult doctor. 
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.