Tips for Efudix Treatment for AK

Hi there, I'm new in this community. Just checking in to see if i can get some information to help with this treatment and healing process.
Last Friday my GP told me the funny little dry scar like patches of non healing skin ( on bridge of nose, forehead and beside my mouth) were AK. He prescribed me a tube of Efudix and told me to apply it morning and night for 4 weeks. He is going to see me at 3 weeks to see how it's going. He also told me if it becomes too painful to have a couple of days off and then try again, he showed me pictures on the net of people with bright red bleeding faces and left me to it!
Well I started using the cream on Friday night and tried to find out as much as i could by Googling. So I immediately stopped wearing make up , perfume and i'm only moisturising the other side of my face to the AK ( it's all on the left hand side of face.) I'm using plain water to wash in the morning (then re-applying cream) and night time before applying night time cream. I'm on Day 5.
I started feeling nauseous on Day 1 and also feeling a bit tired. If i eat something ( especially ginger tea or biscuits) i feel less sick and i'm resting as much as possible.
I've heard the blistering or redness will begin next week? Day 7 to 10.
So trying to prepare for that.
Once my face breaks out in redness and pain , I take it i musn't go outside in the sun? or put anything on the sores? Just stay inside and take painkillers?
And once i've finished this treatment, my face will become scabby and that's when i can start using La Roche-Posay Cicaplast Baume on the sores?
Greatful for any advice. xx