@maralina My doctor also prescribed Clobetasol for my scalp 2x a day. He has me now using it 1x a day for the next 3 months. Haven't heard of Nicotiamide (B3) capsules but will look into them. My doctor told me to take a daily Biotin supplement.
A low histamine diet is very restrictive. The point of it is to get all the histamines out of your system because they cause inflammation and can lead to skin allergies, etc. Histamines naturally occurs in food as it ages/exposed to air. Here is a link that will tell you more of what it is about and what you can and cannot eat. https://www.verywellhealth.com/what-is-a-low-histamine-diet-4694529
Here is a link that can explain the red light cap https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8906269/

Lastly, don't feel like you are being shallow about hair loss. It is very difficult to go through and society/marketing makes it twice as difficult for women. I am trying to go zen about the whole thing and some days are better than others. Mostly trying to focus on the positive and luckily hair pieces and wigs have significantly improved over the years...so there are options.