You can have -
No symptoms.
Mild.
Moderate.
Severe.
Critical.
I have had moderate, to be managed at home, I was advised to call an ambulance by my G.P if my breathing got worse.
I have had symptoms for 3.5 weeks now.
Severe headache that was going across my face, runny nose, chest pain, metallic taste in mouth (only 2 days), breathless on exertion, wheezing, sore throat, ringing in ears, nausea, dizzy at times.
Burning in chest, wheezing &
the worst compression feeling across chest along with a really sore chest to touch and pain in shoulder blades, I cant lay flat due to pain.
I still cant make a full flight of stairs in one go & I will talk to my G.P again tomorrow. Fatigue wears off around 16.30pm til.18.30pm.
I think it might be Pleurisy now.
I am a lone parent with no family for hundreds of miles, my neighbours have got my food.
It really is the worst thing I have ever had.
But everyday I think of those who have been so so much worse 
Its horrible for everyone, because it stops you doing your usual routine.