Using 5FU Cream on Scalp

I suffer from terrible health anxiety regarding my skin and cancer. Doesn’t help that I have had 3 spots of non melanoma removed in the last year. Just had a 3 month check up and doc did not find anything to remove, which should be good, but no my anxiety tells me there must be something growing on my scalp. I have started using 5FU on my scalp as a preventative, but not with my doctors guidance. I have emailed him about this and am waiting to hear from him. Big problem is I don’t really trust myself to make rational decisions about my situation. I have had one AK removed from my scalp a few months ago and had some itchy spots recently but nothing that my doctor commented on at my last skin check last week.
I started to use the cream about 5 days ago and have one spot that has turned red, but could be related to a scratch being enflamed due to cream as much as it being an AK.
Have emailed my doctor about this and waiting to see what he says, but struggling not to go in to have this stuff frozen off.
Any suggestions on handling anxiety and using 5FU in a responsible manner.