F 35- had every blood test listed in here (thyroid, iron, hormones, all vitamins) done for hair loss. Derm. Says all normal. What should be next step?

Adapt to this. You probably have either telegen effluvium which will self cure or alopecia areata for which your choices are a wig, a ball cap, or simply going out as you are. Many people, both men and women, will find the latter choice exotic and fascinating, especially if you are physically fit and have good interpersonal skills. Best wishes.