That's interesting to know Sim Sam re the tea tree oil. It is rather strong
Anyway, since my MW suggested it and the itching is so annoying I bought some oil and have used it 2x already and can report that it does seem to be offering some relief. That aside, I did wake up in the night and had a good old scratch of my arm but generally I think it helped. I just dabbed a little on with a cotton ball.
My MW did mention that she could prescribe me some medication to help it if it got that bad so I will keep that in mind. She did also mention that it will likely come and go so hopefully it decides to go shortly.