Thanks everyone for your responses.

I thought I would update - I have improved a lot (no more nausea during or after shopping). Basically, the only thing I have left are persistent pressure or tension headaches (low grade), a bit of unsteadiness on my feet, and some fatigue during the day.

My question is whether anyone would recommend at this stage for me to start taking medicine for the headaches? Although the headaches are pretty low grade, they are super irritating and distracting. Mark, thank you for the recommendation of a beta blocker - I have a script for atenolol (I have asthma, so can't get propranolol) and I'm hoping it will help. Would anyone recommend me taking anything else? I would like to approach my doctor about this.

BTW, I do take 400 mg of ibuprofen (on average every other day), but I'm reticent to take it on a regular basis as I'm concerned about rebound headaches. It does work quite well. I take only one serving of caffeine a day.

Thank you.