I'm glad you went to see the dermatologist about the rash. Sounds like you may have had exposure to several different plants while you were weeding and now they are fighting each other as well as giving you a fit. I wonder if stress is also keeping the itching, etc., going as well. Your immune system may be a bit compromised and hopefully your doctor will get to the bottom of this rash very quickly.
BTW, did she say anything to you about your laundry detergent and soap, i.e., as to stop using them or using something gentler for the time being?
I hope you feel better soon.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.