For those of you using red/infrared light therapy, did you have any short-term (or long-term) side effects? Yesterday was my first day using the duo coronet light therapy and I did both a morning and evening session. It's pretty comfortable and easy to use. However, I had a dull headache all day, a bit of nausea and just felt off. I never get headaches and have been well so perhaps it was my brain getting used to the therapy or it could have been completely unrelated. This morning no headache thus far but still feeling a little off. Would love to hear others' experiences.