HI, I can understand your concern for the loss of hair including in eyebrows and eyelashes. This condition can be a part of Alopecia Areata whcih is an autoimmune condition of hair fall in localized manner or it can be a part of hypothyroidism also. You get your thyroid profile checked so that accordingly best measures can be applied.You can take vitamins in the form of biotin, calicium pantothenate and other vitamin B complexes. Multivitamin tablets contains all these essential nutrients so you can take it. Additionally increase you protein intake on daily basis and eat sprouts. Eat a lot of green leafy vegetables and sprouts which contains vitamins and minerals necessary for normal hair function. You should consult a dermatologist and take guidance so that exact diagnosis can be done. Take care.