Itchy scalp, sunblock

I was hoping one of you lovely ladies would know where I can look for  information on products and remedies that are safe to use during chemo therapy. I had my first FEC dose on Monday, came out in a red rash through my scalp, chest and breast (has improved heaps) but my scalp is seriously itchy. I had itchy scalp issues before chemo and do expect it to get worse, wondering if there was anything I can use for temporary relief that doesn’t cause more problems. Also, I have sensitive skin, I need a sunblock that won’t irritate. 
Is there a ‘recommended go to’ site out there that might answer my questions, without trolling google and coming across avoidable information.
Thanks in advance xxx