I use a dye on my hair I purchased in the grocery store about a month ago, and lost a lot of hair, what should I do?

Dyes can produce chemical burns and ‘kill’ hairs permanently. If it  does not grow back in 6 months, then you may have produced a chemical burn to your hair follicles and they may not grow back.  If there is going to be a recovery, the hair cycle usually kicks in and starts growing within about 6 months or less after the injury or earlier. See a specialist either now or certainly in 6 months?