PartSkeptic
Illuminator
You are still assuming that your hypothesis as to the cause of your headaches is correct. That is what this test is actually going to establish. You might be barking up the wrong tree entirely, and extending the period during which you are suffering unnecessarily. That's why you need to be prioritising doing the test rather than looking for excuses to put it off which, frankly, is what you seem to be doing.
Stop taking pain killers pre-emptively (which as others have pointed out is a silly, even dangerous, thing to be doing) and stay home for a couple of days. Then do a couple of trials a day for three days. You should be doing nothing else (are these trips out really necessary?) until you have evidence either way for your hypothesis. Then, and only then, can you reasonably decide your next course of action.
Yes, the trips are absolutely necessary. There are a bunch of small jobs at the old house that even if we used contractors, I would still have to go there to open up and to instruct. I have to get my new bank card from the bank. I have to pick up a registered letter. I have to get my monthly prescription. And so on. My wife is trying to sell her business and her factory. I am the only one who can repair those old machines.
No, I do not yet have the luxury of staying home yet.
Today, I got rid of the bacterial infection I have had for the last three days and after being home for two full days I am in quite good shape. Do I want to make myself sick today to prove a (useless?) point?